path: root/NEWS

Snapshot 2.99.909 (2013-02-01)
==============================
Pass the brown paper bag. Ridiculously stupid bug in last minute coding.

  * Add Xv support using glamor acceleration in addition to adaptors
    provided by the UXA backend.

  * Fix overeager discarding of CPU damage
    Regression in 2.99.908 :(
    https://bugs.freedesktop.org/show_bug.cgi?id=74327


Snapshot 2.99.908 (2013-01-31)
==============================
A couple of regressions dashed the hopes that .907 was to be the final
release candidate, so time to start the cycle again after applying a few
more bugfixes.

  * Fix invalid pageflipping of GLXPixmaps by UXA.
    https://bugs.freedesktop.org/show_bug.cgi?id=73282

  * Consistently treat DPMS Suspend/Standy as Off, otherwise we may
    incorrectly restore the backlight in UXA.

  * Fix disabling the backlight in UXA when querying the value whilst off
    https://bugs.freedesktop.org/show_bug.cgi?id=73181.

  * Invalidate between every operation if rendering into the source or mask.
    Fixes regression in 2.99.907 on Ivybridge (seen in KDE)
    https://bugs.freedesktop.org/show_bug.cgi?id=73208

  * Check for available batch buffer state before restoring state on gen4,
    otherwise we overwrite surface state with commands and cause a GPU hang.
    https://bugs.freedesktop.org/show_bug.cgi?id=73348

  * Prevent an invalid free by TearFree
    https://bugs.freedesktop.org/show_bug.cgi?id=73469

  * Fix confusion in TearFree when it tried to pageflip to a stale bo
    https://bugs.freedesktop.org/show_bug.cgi?id=70905

  * Initialise TearFree contents with the current frontbuffer upon creation,
    otherwise old content may be visible for significant fractions of a
    second after resume or DPMS on
    https://bugs.freedesktop.org/show_bug.cgi?id=73842

  * Nullify the old pointer into a CPU mmapping of the bo when promoting it
    on the GPU. Eventually that old pointer becomes invalid and will cause
    the Xserver to crash.
    Fixes regression in 2.99.906
    https://bugs.freedesktop.org/show_bug.cgi?id=73351

  * Restore the serialNumber on the GC correctly after falling back to
    software. This was seen to cause corruption with Wine.
    https://bugs.freedesktop.org/show_bug.cgi?id=73856

  * Do not ignore CPU damage on a pixmap unless the Composite operation
    will completely overwrite it. This was observed in xfce4.
    https://bugs.freedesktop.org/show_bug.cgi?id=69528

  * Skip fake outputs during initial probe as they can cause a NULL pointer
    dereference.
    https://bugs.freedesktop.org/show_bug.cgi?id=73981

  * Fix rendering of dashed zero-width lines onto 24bit buffers
    https://bugzilla.redhat.com/show_bug.cgi?id=1059152

  * Cap the freed Pixmap cache and reuse it more often
    Fixes a regression in 2.99.907 that caused the memory used by X to
    grow until it was cleaned up during server regreneration
    https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1272338


Snapshot 2.99.907 (2013-12-30)
==============================
The highlight here is that things seem to be quietening down on the bug
reporting front. All is not quiet as you will see below, and maybe it is
just the holiday season that is approaching*, but there has been a
remarkable falloff in bug reports. Lets hope this trend holds and we can
make a stable release shortly!

* This was intended to be sent a couple of weeks ago and the holiday season
has been very quiet....

Oh, and acceleration support for Intel's next generation of
integrated processor graphics has landed, codenamed Broadwell.

 * Fix potential X server infinite recursion (crash) from a gen2 bug fix
   Regression in 2.99.906
   https://bugs.freedesktop.org/show_bug.cgi?id=71605

 * Workaround a missing pipeline flush within Ivybridge, that would
   leave black rectangles randomly over the output
   https://bugs.freedesktop.org/show_bug.cgi?id=68410

 * Fix tiled fills. gen2-3 and gen4+ had two different bugs that
   both broke rendering with small 8x8 patterns in some circumstances
   https://bugs.freedesktop.org/show_bug.cgi?id=71260

 * Fix reads from a cropped video image using a packed pixel format.

 * Another clear the clear hint after DRI2 SwapBuffers, like the bug fixed
   in 2.99.903. Failure to clear the hint would cause read backs of the
   frontbuffer (Xvnc) to be blank.
   https://bugs.freedesktop.org/show_bug.cgi?id=72194

 * Disable VSync on Baytrail
   https://bugs.freedesktop.org/show_bug.cgi?id=69869

 * Handle partial uploads with TearFree correctly
   https://bugs.freedesktop.org/show_bug.cgi?id=72343
   https://bugs.freedesktop.org/show_bug.cgi?id=72430

 * Avoid recusing through DRI event handlers whilst processing TearFree,
   leading to a double free (and memory corruption)
   https://bugs.freedesktop.org/show_bug.cgi?id=72690

 * Hide the gen4 render corruption by crippling the GPU
   https://bugs.freedesktop.org/show_bug.cgi?id=55500


Snapshot 2.99.906 (2013-11-13)
==============================
Several stability fixes required after the recent tweaking of the core
mechanics to handle the updated TearFree and attempting to make static
analyzers happy.

 * Fix damage handling when rendering to a partially damaged GPU surface.
   Regression in 2.99.905
   https://bugs.freedesktop.org/show_bug.cgi?id=70527

 * Use asprintf() instead of sprintf()
   Regression in 2.99.905
   https://bugs.freedesktop.org/show_bug.cgi?id=70835

 * Improve accounting for fence overallocation on older gen2/3, and
   improve the tiling mechanism to fit into the same aperture constraints
   https://bugs.freedesktop.org/show_bug.cgi?id=70924

 * Add an extra GPU flush on Sandybridge to fix some rare font corruption

 * Rasterise lines through all clip boxes
   https://bugs.freedesktop.org/show_bug.cgi?id=70802

 * Fix regression from stricter handling of failures to move a GC to the GPU
   Regression in 2.99.905
   https://bugs.freedesktop.org/show_bug.cgi?id=71415

 * Fix various fail along the memcpy_xor paths, including inadequate error
   handling and integer overflow
   https://bugs.freedesktop.org/show_bug.cgi?id=70527

 * Fix outside-of-target stipple uploads
   https://bugs.launchpad.net/bugs/1247785

 * Fix clip detection for long glyphs
   Incomplete bug fix (causing a regression) in 2.99.905
   https://bugs.freedesktop.org/show_bug.cgi?id=70527

 * Fix VSync for the render engine (Xv) on Haswell
   https://bugs.freedesktop.org/show_bug.cgi?id=70527


Snapshot 2.99.905 (2013-10-23)
==============================
The highlight for this snapshot is the extension of TearFree to support
transformed outputs, along with some polishing to eliminate its impact
upon input and output latency. As always, thanks to everyone who have
been testing, reporting bugs and helping to improve the stability before
release.

 * Prevent a crash when starting with a user specified mode or position

 * Prevent some crashes in UXA after allocation failure

 * Stop marking the user's preferred backlight value as 0 if the
   backlight property is queried whilst the connector is disabled
   https://bugs.freedesktop.org/show_bug.cgi?id=70406

 * Pad GETCONNECTOR ioctl for compatability between 32/64-bit userspace
   and kernel

 * Handle long glyph runs correctly
   https://bugs.freedesktop.org/show_bug.cgi?id=70541

 * Fix clipping of stippled rectangles against clip regions
   https://bugs.freedesktop.org/show_bug.cgi?id=67865

 * Support TearFree rendering of rotated outputs
   https://bugs.freedesktop.org/show_bug.cgi?id=22969


Snapshot 2.99.904 (2013-10-09)
==============================
There is one more feature planned to be completed for 3.0, so time for a
snapshot beforehand to push out the bug fixes from the last week.

 * Fix video output using sprites when changing the image size

 * Apply more restrictive tile constaints for 915g class devices
   https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1232546

 * Ensure all overlapping rectangles are drawn for XRenderFillRectangles
   https://bugs.freedesktop.org/show_bug.cgi?id=66313

 * Fix trapezoid clipping against the left-edge
   https://bugs.freedesktop.org/show_bug.cgi?id=69469

 * Prevent discarding active upload buffers, causing glitches in chromium
   https://bugs.freedesktop.org/show_bug.cgi?id=66990

 * Prevent specifying a negative timeout to select if the BlockHandler
   takes too long to update the display

 * Promote the Ironlake pipecontrol to be a full pipeline flush to
   prevent render cache corruption
   https://bugs.freedesktop.org/show_bug.cgi?id=51422

 * Never pass an invalid trapezoid to pixman
   https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1197921

 * Prevent out-of-bounds access by overassigning work amongst threads
   https://bugs.freedesktop.org/show_bug.cgi?id=70204

 * Make sure the current mode is always listed amongst the output modes
   https://bugs.freedesktop.org/show_bug.cgi?id=70132

 * Build fixes for 1.14.99.2


Snapshot 2.99.903 (2013-09-28)
==============================
Lots more stabilization work, not yet peaceful enough to christen 3.0. We
have everything ranging from build fixes for systems like Suse Linux
Enterprise Desktop that like to backport hardware enablement to ancient
packages, to fixes for hardware enabling, and some more performance tuning.

 * Fix VSync on Haswell.
   https://bugs.freedesktop.org/show_bug.cgi?id=69119

 * Disable Y-tiling on gen4 - it too frequently leads to instability.
   https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1222203

 * Disable same EDID detection based on property id - the kernel likes
   to reuse ids leading to a failure to detect the right modes on a monitor
   change.

 * Avoid issuing multiple DPMS requests to the same encoder (alised to
   multiple connectors) to avoid upsetting Haswell and leaving the
   screens blank.

 * Honour the user preferrence for the initial mode, even if they are
   being silly
   https://bugzilla.novell.com/show_bug.cgi?id=841696

 * Clear the clear hint when apply DRI updates - to prevent some
   screenshots from GL windows being left blank.
   https://bugs.freedesktop.org/show_bug.cgi?id=69730

 * Prevent a NULL dereference from trying to undo an non-existent buffer
   https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1228677

 * Handle out-of-memory conditions far more gracefully. If the system is
   hard against the memory wall, then the kernel will start issuing
   SIGBUS even for CPU mmaps. Untrapped these will cause X to die.
   https://bugs.freedesktop.org/show_bug.cgi?id=67889


Snapshot 2.99.902 (2013-09-07)
==============================
We do not condone or support Canonical in the course of action they have
chosen, and will not carry XMir patches upstream.
-The Management

Snapshot 2.99.901 (2013-09-04)
==============================
What's this? A pre-release snapshot of an upcoming 3.0 major release?
What could be the big new feature about to land? SNA by default!
Not only that, we also have a preview of the XMir integration patches.

Whilst we consider the SNA acceleration method to be ready to take over
from UXA (the current acceleration method), it still remains possible to
switch over to the old method with the following xorg.conf snippet:
  Section "Device"
    Identifier "Device0"
    Driver "intel"
    Option "AccelMethod" "UXA"
  EndSection

The promise of SNA is that it improves the user experience by providing a
faster, more fluid, desktop, that is both more power efficient and less
prone to crashes than UXA. If it still fails to meet your expections,
please file bugs!


Release 2.21.15 (2013-08-21)
============================
Some build fixes for the BSDs and alternate compiler, and conflicting
configure options and a critcial fix for some PRIME setups.

 * Don't fail to configure if DRI1 is not available and the user asks
   for both DRI and KMS-only
   [Regression from 2.21.14]

 * Lots of miscellaneous fixes for older gcc, other compilers and BSD.

 * Initial framework support for hosted X.

 * Improve transition from fbcon to X with multiple outputs and extended
   desktops.

 * Ensure the framebuffer exists before checking it against the CRTC
   constraints.
   https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/121234
   [Regression from 2.21.10]

 * Add RGB overlay support for Ironlake and later.

 * Don't release the overlay buffer too early, i.e. before the client
   disables the Xv image.

 * Tweak the ring switching logic to reduce use of semaphores on
   Sandybridge and later - a delicate balancing act between trying to
   use the faster engine for the task and preventing concurrent use of
   multiple rings.


Release 2.21.14 (2013-08-04)
============================
A few updates for the top-end Haswell systems (notably GT3 and GT3e
systems), in particular, setting the appropriate thread counts for the
larger GPU and handling a few scaling issues with the emedded DRAM. More
important than the performance tuning though is a fix for a critical
issue encountered by a few people on gen4/gen5 systems.

 * Initial performance tuning for HSW:GT3e

 * Fix a crash with Planetary Annihilation

 * Disable triple buffering for compositors

 * Reserve space in the exec buffer array for deferred VBOs.
   https://bugs.freedesktop.org/show_bug.cgi?id=67504


Release 2.21.13 (2013-07-27)
============================
A minor release to repair the build for non-Linux systems, and to undo a
few more regressions.

 * Avoid potential memory corruption with allocations of very small
   depth 1 bitmaps.

 * Fix source clipping whilst computing copy extents and exposures.
   [Regression from 2.21.12]
   https://bugs.freedesktop.org/show_bug.cgi?id=66970

 * Use /proc/cpuinfo if cpuid4 is not available (old hardware or old
   gcc), and repair the build on systems without cpuid.
   [Regression from 2.21.12]

 * Fix performance regression on Ironlake from inadvertently flushing
   after every operation.
   [Regression from 2.21.11]
   https://bugs.freedesktop.org/show_bug.cgi?id=67157

 * Fix conflict handling when probing initial KMS configuration for
   ZaphodHeads.
   [Regression from 2.21.11]
   https://bugs.freedesktop.org/show_bug.cgi?id=67176

 * Stop being overly restrictive and rejecting stale DRI2 buffers.
   (DRI2 is inherently racy in that the client may have completed and
   submitted rendering to buffers that are now invalid on the server.
   This race is magnified by bugs within the Xserver where it forgets
   to notify the DRI2 clients of certain invalidation events.)
   https://bugs.freedesktop.org/show_bug.cgi?id=67210

 * Handle a failure to use a GTT mmap for a pixmap upload and try
   an alternative method before giving up.


Release 2.21.12 (2013-07-14)
============================
In this release, we clear up the teething troubles from preserving the KMS
configuration, notably external connections on Haswell and plugging in new
outputs after startup were broken. Besides these regression fixes, there
are a couple of fixes for some long standing issues, such as incorrect
rendering on gen2, an infinite loop with very, very large pixmaps and a
slight improvement to the tempermental gen4.

 * Allow untiled scanouts again (required for large extended desktops on
   gen2 and gen3).
   [Regression from 2.21.11]

 * Use the correct count of the number of dirty damage boxes for the quick
   check on whether the existing damage contains the requested area.
   The danger is that we may get a false result and skip migration and so
   cause pixmap corruption (in the unlikely event that the application
   frequently causes fallbacks).
   [Regression from 2.21.11]
   https://bugs.freedesktop.org/show_bug.cgi?id=66430

 * Fix initial connection probing for multi-function encoders, such as the
   external connections on Haswell.
   [Regression from 2.21.11, initial connection probing]
   https://bugs.freedesktop.org/show_bug.cgi?id=66488

 * Fix gen2 rendercopy into a8 surfaces, for example, glyph uploads into
   the glyph cache.

 * Fix detection of user overrides for initial connection configuration.
   The code used the xorg-server-1.15 values, having missed the
   introduction of ZoomModes into that release.
   [Regression from 2.21.11, initial connection probing]

 * Always initialise the gamma ramp, even on unconnected CRTCs.
   https://bugs.freedesktop.org/show_bug.cgi?id=66563
   [Regression from 2.21.11, initial connection probing]

 * Some more tuning of the gen4 vertex corruption workaround. The root
   cause behind the GPU using incorrect texture coordinates is still
   not solved, but by reducing the maximum number or rectangles in
   flight through the GPU we reduce the likelihood of corruption.

 * Fix compilation with gcc-4.5
   [Regression from 2.21.11]

 * Avoid integer overflow when performing tiled uploads and operations
   on very large (>28k pixels wide or tall pixmaps)
   https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1200766


Release 2.21.11 (2013-06-30)
============================
An eventful week. What started with a regression with some builds of
firefox on some machines lead ultimately to the discovery of an older
kernel bug. Aside from the work to fix the image bug and a few other
older bugs that were reported and resolved this week, there is also a
(hopefully) subtle change to the initial configuration of displays. In
the absence of user overrides in xorg.conf, the DDX will try to preserve
the same display configuration as used by the kernel, which hopefully
will be the same configuration as setup by the BIOS. The result should
be a boot sequence that does not resize at all (aka fastboot) - until
the display manager takes over and loads a completely different
configuration!

 * Add reference counting of drmMaster for ZaphodHeads
   https://bugs.freedesktop.org/show_bug.cgi?id=66041

 * Add a GPU flush before changing blend modes on Ironlake
   https://bugs.freedesktop.org/show_bug.cgi?id=51422

 * Fix occasional missing images for inplace uploads
   [regression from 2.21.10]
   https://bugs.freedesktop.org/show_bug.cgi?id=66059

 * Add missing utility files to the tarball and remove a few unused ones

 * Initialise PolyPoint operand state before calling miWideDash
   https://bugs.freedesktop.org/show_bug.cgi?id=66104

 * Fix redirection handling for rendering into large surfaces
   https://bugs.freedesktop.org/show_bug.cgi?id=66168
   https://bugs.freedesktop.org/show_bug.cgi?id=66249

 * Fix compilation of UXA with xorg-xserver < 1.10
   [regression from 2.20.0]

 * Fix consideration of gradients for deciding when to migrate render
   operations
   [performance regression from 2.21.10, the bug itself is older]
   https://bugs.freedesktop.org/show_bug.cgi?id=66297

Also fixed this week was:

commit 22fd5ca947b58901927d100d2b1aa0f1672b3435
Author: Chris Wilson <chris@chris-wilson.co.uk>
Date:   Fri Jun 28 16:54:08 2013 +0100

    drm/i915: Only clear write-domains after a successful wait-seqno

which affects kernels 3.7 - 3.10, coming to a stable kernel near you soon.


Release 2.21.10 (2013-06-22)
============================
Fixes missing support for Xv (with the textured video adaptor) on
Haswell, and an old bug with wide monitors on various generation. Along
with a few other regression fixes and performance tweaks for various
corner cases.

 * Do not lose track of fast pageflips across mode changes
   [regression from 2.20.8]

 * Fix listing of Visuals for Xv
   [regression from 2.21.8]
   https://bugs.freedesktop.org/show_bug.cgi?id=65479

 * Improve coherency of concurrent CPU accesses to a pixmap
   https://bugs.freedesktop.org/show_bug.cgi?id=61628

 * Set sampler swizzling for textured video on Haswell
   https://bugs.freedesktop.org/show_bug.cgi?id=65699

 * Apply scanout stride limits
   https://bugs.freedesktop.org/show_bug.cgi?id=65099

 * Undo the self-copy for cloned pixmaps for loimpress's animations
   [regression from 2.21.7]
   https://bugs.freedesktop.org/show_bug.cgi?id=65665


Release 2.21.9 (2013-06-06)
===========================
Consolidating the copy-on-write support, hopefully cleaning up the last of
the regressions.

 * Restore vsync on textured videos.
   [regression from 2.21.8]
   https://bugs.freedesktop.org/show_bug.cgi?id=65048

 * Fix incorrect ordering of possible_clones with certain outputs, which
   can lead to attempting to incorrectly clone 2 outputs and failing to
   light them up.
   [regression from 2.20.10]

 * Fix performance regression from not promoting large fills to the GPU
   [regression from 2.21.7]

 * Undo the pixmap clone before performing a DRI2CopyRegion
   [regression from 2.21.7]
   https://bugs.freedesktop.org/show_bug.cgi?id=65250


Release 2.21.8 (2013-05-27)
===========================
A quick release to cleanup a few regressions from the introduction of
copy-on-write support, notably hitting wine applications and a memory
leak for firefox.

 * Only mark a PolyFillRect operation as replacing if it is unclipped
   https://bugs.freedesktop.org/show_bug.cgi?id=64841

 * Prevent potential NULL dereference of damage when checking COW support

 * Fix invalidation of clone after dirtying the pixmap via the CPU

 * Prevent discarding an operation before requiring it for a fallback

 * Fix memory leak from replacing the clone under certain circumstances
   https://bugs.freedesktop.org/show_bug.cgi?id=64978


Release 2.21.7 (2013-05-21)
===========================
A couple of weeks turned into a month and a couple of weeks... Amidst
the usual bug fixes, we have added the complete set of Haswell PCI IDs -
hopefully future proofing ourselves against being surprised by new
products. We can also now use the correct term for the top of the range
Haswell variants, GT3.

 * Fix several assertion failures hit by Jiri Slaby.

 * Allow XvMC to also target overlay/sprite planes.

 * Throw in a paranoid MI_FLUSH between BLT and RENDER operations on
   Ironlake.
   https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1168066

 * Prevent reuse of old framebuffers after a resize.
   https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1157678

 * Fix compilation with --enable-valgrind and no --enable-debug

 * Improve partial migration of render sources.

 * Fix origin of trapezoids.
   https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1178020

 * Introduce copy-on-write support for cloning pixmaps. The ultimate
   goal here is to efficiently support the TearFree mode of operation,
   but this provides immediate benefits with firefox - most importantly
   because of the inefficient way it now implements scrolling.


Release 2.21.6 (2013-04-06)
===========================
A surprising highlight of this release is a little refresh to the KMS
support for OpenBSD. OpenBSD now has its own KMS implementation which is
mostly compatible with the interface in Linux, with one or two tweaks
supplied by Mark Kettenis. This release continues to cleanup behaviour
for Haswell.

 * Workaround a failure by the xserver to invalidate DRI buffers
   following a pixmap change for XComposite redirection.
   https://bugs.freedesktop.org/show_bug.cgi?id=62614

 * Fix computation of clip extents for stippling
   https://bugs.freedesktop.org/show_bug.cgi?id=62618

 * Support KMS on OpenBSD, by Mark Kettenis

 * Clean up sockets upon CloseScreen (making ourselves better behaved
   for muxed setups).

 * Fix the tests for AVX/AVX2 support in CPUID and remember to check for
   OS support as well.

 * Report a monotonic UST value for undisplayed drawables rather than 0
   by Daniel Kurtz

 * Fix video playback on gen4 through a complex clip (more gen4 GPU woes)
   https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1162046


Release 2.21.5 (2013-03-21)
===========================
Haswell reintroduces a command to load the scanline window from the
command stream and so requires its own specialised wait-for-vsync routine
- failure to do so was then causing hangs when trying to do tearfree video
or use a compositor.

 * Prevent buffer leak if a non-fullscreen Window is closed with multiple
   pending swap events.

 * Fix offset transformation for fallback gradient paths.
   https://bugs.freedesktop.org/show_bug.cgi?id=62198

 * Prevent Glamor from crashing if misconfigured.
   Thanks to Michel Dänzer.

 * Prevent UXA from crashing if torn down during PreInit.
   Thanks to Aaron Plattner.

 * Prevent miscompilation with different functional units having different
   compiler flags. Some functions were expected to be inlined and so
   recompiled with the current target. However, some compilers were
   choosing to emit subroutine calls instead without noticing that the
   ABI was different between the caller and callee - causing corruption.
   https://bugs.freedesktop.org/show_bug.cgi?id=62198

 * Fix rendering of CompositeTriFan with recent Xorg.

 * Apply the video src-offset fix highlighted in the last release!
   A typo prevented the fix from working for gen4+.
   https://bugs.freedesktop.org/show_bug.cgi?id=62343

 * Fix rendering of multiple glyphs to very large destination surfaces
   https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1156387

 * Fix scanline waits for Haswell
   https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1156679


Release 2.21.4 (2013-03-11)
===========================
More bugs, more fixes, more releases. A minor new feature being introduced
is the runtime detection of CPU instructions sets along with specialised
paths to take advantage of the available CPU.

 * Honour LinearFramebuffer for clumsy PowerXpress integration

 * Disable read-read optimisations of mappings whilst the root
   cause of a corruption issue remains elusive.
   https://bugs.freedesktop.org/show_bug.cgi?id=61628

 * Disable 8-bpp framebuffers in UXA as the regressions therein
   remain unfixed.

 * Restart vertex checks after lock contention
   https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1124576

 * Handle Screen Pixmap recreation whilst exported via PRIME.

 * Correct application of scale factors to video source offsets.
   https://bugs.freedesktop.org/show_bug.cgi?id=61610

 * Chain up CloseScreen so that resources are actually freed across regen
   https://bugs.freedesktop.org/show_bug.cgi?id=56608

 * Fix Haswell CRW PCI-IDs

 * Handle batch submission failure during DRI copies
   https://bugs.freedesktop.org/show_bug.cgi?id=61708

 * Probe for kernel support of requested Screen depth
   https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1135403

 * Correct GPU limits for early gen2 and gen3 architectures and prevent
   an infinite recursion for particular image sizes.


Release 2.21.3 (2013-02-20)
===========================
A few minor bugfixes, another point release.

 * Fix tracking of DRI pixmaps and their backing bo across reparenting. If
   we tried to execute a SwapBuffers after a Window was reparented, but
   before the DRI client has updated its references, then we would end up
   manipulating an exported pixmap without a flush flag set. In the worst
   case, this would culminate in a segfault in the driver.
   https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1127497

 * Restore the gen4 workarounds for flickering rendering - a few cases still
   remain, as the root cause persists.
   https://bugs.freedesktop.org/show_bug.cgi?id=60402

 * Double check that the device has KMS enabled before claiming. This allows
   X to gracefully fallback to VESA/fbdev rather than bailing out.
   https://bugs.freedesktop.org/show_bug.cgi?id=60987

 * Fix the UXA render programs for projective transforms on Ivybridge.


Release 2.21.2 (2013-02-10)
===========================
Pass the brown paper bags, I need half a dozen or so. That seemingly
innocuous build fix with xorg-1.13 happened to have the little side-effect
of breaking glyph rendering with xorg-1.12 and older on 64-bit machines.


Release 2.21.1 (2013-02-10)
===========================
A fix for a potential GPU hang on 945gm (GMA950) and earlier chipsets,
along with backporting SNA to the packages found in stable distributions
like Debian 6.0 (Squeeze).

 * Cleanup compilation warnings from deblint, thanks to Paul Menzel

 * Minor build improvements by Damien Lespiau.

 * Disable generating span geometry for non-rectilinear spans on gen4
   in order to work around and prevent one class of render corruption.

 * Prevent cache thrashing and severe performance degradation on LLC
   machines for streaming texture updates. However, note the effect was
   only observed on just one particular laptop.

 * Fix alignment of subsurface proxies for old chipsets.
   https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1120108

 * Repair build against Xserver-1.6 and contemporary packages.


Release 2.21.0 (2013-02-01)
===========================
A few new features:

 * Enable render acceleration for Haswell GT1/GT2.

 * Enable multi-threaded rasterisation of trapezoids and fallback composition

 * Utilise a new kernel interface (v3.9) for processing relocations

along with a few older features from the 2.20.x series:

 * PRIME support for hotplug GPUs and hybrid systems

 * Support for IvyBridge GT1 machines, aka HD2500 graphics.

 * Stable 830gm/845g support, at last!

As usual we have a large number of bug fixes since the last release:

 * Prevent a stray relocation being left after a buffer is removed from
   a batch, leading to GPU hangs.

 * Make the driver more robust against its own failures to submit batches
   by falling back to software rendering.

 * Fix emission of scanline waits for secondary pipes on gen6/7. Otherwise
   you may encounter GPU hangs in MI_WAIT_FOR_EVENT.

 * Fix a missing corner pixel when drawing rectangles with PolyLines
   https://bugs.freedesktop.org/show_bug.cgi?id=55484

 * Don't try to use Y-tiling colour buffers with mesa/i915c as mesa
   doesn't support them and wil fallback to software rendering

 * Ensure that any cached mmaps are invalidated for a SwapBuffers
   https://bugs.freedesktop.org/show_bug.cgi?id=60042

 * Correctly handle the composition of rotated displays too large for the
   3D pipeline
   https://bugs.freedesktop.org/show_bug.cgi?id=60124

 * Fix the computation of the planar video frame size
   https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1104180


Release 2.20.19 (2013-01-20)
============================
A quick release as the last broke USB DisplayLink slave outputs badly. The
performance of those displays was unusable due to an inadvertent change that
caused us to flush the entire scanout over the USB for every drawing
operation.

 * Implement the GNOME Build API. A couple of minor changes to make
   integrators and distributors lives a little easier, or at least more
   consistent.

 * Correctly offset inplace trapezoids for subwindows, such as the GTK+
   close button after it has a background image uploaded.

 * Explicitly prevent ring-switching for synchronized rendering to
   scanouts (for vsync).

 * Clip dirty region to slave pixmaps (otherwise UDL is nigh unusuable)
   https://bugs.freedesktop.org/show_bug.cgi?id=59539


Release 2.20.18 (2013-01-16)
============================
A bunch of miscellaneous fixes for assertion failures and various
performance regressions when mixing new methods for offloads, along with
a couple of improvements for rendering with gen4.

 * Remove use of packed unnormalized texture coordinates on gen4/5 as
   these GPUs do not support unnormalized coordinates in the sampler.

 * Remove dependency upon x86 asm for cross-building to unsupported
   architectures.
   https://bugs.gentoo.org/show_bug.cgi?id=448570

 * Apply damage around PRIME updates in the correct order.

 * Correctly read the initial backlight level for when the user
   overrides UXA's choice of backlight controller.

 * Throttle UXA and prevent it queuing work much faster than the GPU can
   complete it. This realised itself in impossible performance figures and
   the entire display freezing for several seconds whlist the GPU caught
   up. One side effect is that it also caused the DDX to consume more
   memory than was required as it could not recycle buffers quick
   enough, and in some cases this produces a marked improvement in
   performance. Also note on gen2/3 this requires a new libdrm [2.4.41]
   in order to prevent a bug causing the DDX to fallback to swrast.

Release 2.20.17 (2012-12-26)
============================
A minor update to prepare for co-operating with the kernel over managing
stability on 830gm/845g. On this pair of chipsets, the kernel will perform
an extra copy of the batchbuffer into reserved memory, which prevents them
from randomly dying. However, that extra copy does have a noticeable
impact upon throughput, so we also have a mechanism for userspace to
opt-out of the kernel workaround and take responsibility for ensuring its
batches are coherent.

 * Build fixes against xorg-1.14
   https://bugs.freedesktop.org/show_bug.cgi?id=58552
   https://bugs.freedesktop.org/show_bug.cgi?id=58406

 * Fixed the origin of cropped (textured) video windows (Xv and XvMC)
   https://bugs.freedesktop.org/show_bug.cgi?id=23033

 * Fix potential corruption when using images larger than ~1GiB


Release 2.20.16 (2012-12-15)
============================
Rejoice! We have found a trick to make 830gm/845g stable at long last.
Ever since the switch to GEM and dynamic video memory, those early
second generation chipsets have been plagued by instability. The lack of
flushing cachelines from the CPU to GMCH was eventually solved by using
an undocmented bit, but 830/845 were still hanging under memory pressure.
These deaths were all due to garbage finding its way into the command
streamer, and they go away if we take a leaf out of the original driver
and never reuse those pages for anything else. So for the first time
ever, I have been able to complete running the test suite on an 845g,
even whilst thrashing the page and buffer caches!

 * Run the SF stage as single-threaded on gen4 to workaround a few issues
   https://bugs.freedesktop.org/show_bug.cgi?id=57410

 * Keep the scanout SURFACE_STATE separate to avoid overriding its
   memory access control on gen6/7 (i.e. writes to the scanout need to
   be kept out of the render cache)

 * Tune batch flushing after an operation to an exported surface under a
   compositor.

 * Make sure the source is on the CPU for inplace composition of trapezoids
   using the CPU
   https://bugs.freedesktop.org/show_bug.cgi?id=56825

 * Immediately flush in the block hander after a split batch to reduce
   latency between the two halves of an operation.
   https://bugs.freedesktop.org/show_bug.cgi?id=51718

 * Install a fallback config if we fail to install the desired config
   at VT switch (i.e. booting, after resume with 3 incompatible pipes on
   Ivybridge)

 * Pin batches to avoid CS incoherence on 830/845
   https://bugs.freedesktop.org/show_bug.cgi?id=26345


Release 2.20.15 (2012-12-03)
============================
And lo, enabling more of the common acceleration paths for gen4 revealed
another lurking bug - something is wrong with how we prepare Y-tiling
surfaces for rendering. For the time being, we can surreptiously disable
them for gen4 and avoid hitting GPU hangs.

 * Avoid clobbering the render state after failing to convert the
   operation to use the blitter.
   https://bugs.freedesktop.org/show_bug.cgi?id=57601

 * Disable shadow tracking upon server regeneration, and so fix a crash
   if you restart the server whilst a RandR transform (e.g. rotation) is
   in effect.
   https://bugs.freedesktop.org/show_bug.cgi?id=52255
   https://bugs.freedesktop.org/show_bug.cgi?id=56608


Release 2.20.14 (2012-11-26)
============================
The highlight of this release is gen4, from 965g to gm45. Quite an old
bug surfaced in the shader assembly, sparking a chance to review a few
design choices within that backend and experiment on fresh ways to
workaround the remaining issues.

 * Avoid using inplace XOR'ed uploads for very large buffers
   https://bugs.freedesktop.org/show_bug.cgi?id=57031

 * Fix the gen4/5 opacity shader
   https://bugs.freedesktop.org/show_bug.cgi?id=57054

 * Queue a pending vblank request after flip completion
   https://bugs.freedesktop.org/show_bug.cgi?id=56423

 * Avoid migrating an uninitialised pixmap for use as a render source
   https://bugs.freedesktop.org/show_bug.cgi?id=47597

 * Improve handing of texture fallbacks for 830/845.
   https://bugs.freedesktop.org/show_bug.cgi?id=57392


Release 2.20.13 (2012-11-11)
============================
Nothing but bug fixes. Many thanks to everyone who took the time to
report their issues, and for their help in improving the driver.

 * Sanity check the platform probe points to our expected i915 device
   https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1069031

 * Prevent 16-bit overflow for computing the sample area to upload of
   sources for render operations
   https://bugs.freedesktop.org/show_bug.cgi?id=56324

 * Clamp the drawable box for migration to prevent 16-bit overflow
   https://bugs.freedesktop.org/show_bug.cgi?id=56591

 * Disable RandR hotplug events if Xinerama is enabled and thereby prevent
   a crash upon hotplug
   https://bugs.freedesktop.org/show_bug.cgi?id=55260

 * Call ValidatePicture before attempting to flatten the alphamaps
   https://bugs.freedesktop.org/show_bug.cgi?id=56367

 * Clip the trapezoid correctly if it ends on the boundary pixel
   https://bugs.freedesktop.org/show_bug.cgi?id=56395

 * Make sure the pipeline choice is propagated to the scanline wait
   across a batch flush
   https://bugs.freedesktop.org/show_bug.cgi?id=47597

 * Set the valid drawable box when choosing placement of BLT composite ops
   https://bugs.freedesktop.org/show_bug.cgi?id=47597

 * Prevent use-after-free when promoting a partial-GPU bo to a full-GPU bo
   https://bugs.freedesktop.org/show_bug.cgi?id=56591

 * gen4 opacity spans require the per-rectangle workaround
   https://bugs.freedesktop.org/show_bug.cgi?id=55500

 * Prevent use of invalid damage pointers when redirecting rendering
   https://bugs.freedesktop.org/show_bug.cgi?id=56785


Release 2.20.12 (2012-10-20)
============================
More bug reports, more bug fixes! Perhaps the headline feature is
that with a secure batches, coming to a 3.8 kernel near you, we may
finally have the ability to perform updates to the scanout synchronized
to the refresh rate on later SandyBridge and IvyBridge chipsets. It comes
at quite a power cost as we need to keep the GPU out of its power saving
modes, but it should allow legacy vsync to function at last. But this
should allow us to address a longstanding issue with tearing on
SandyBridge+.

 * Fix component-alpha rendering on IvyBridge, for example subpixel
   antialiased glyphs.
   https://bugs.freedesktop.org/show_bug.cgi?id=56037

 * Flush before some "pipelined" state changes on gen4. The evidence is
   that the same flushes as required on gen5+ are also required for gen4.
   https://bugs.freedesktop.org/show_bug.cgi?id=55627

 * Prevent a potential crash when forcing a stall on a busy CPU bo
   https://bugs.freedesktop.org/show_bug.cgi?id=56180

[Release 2.20.11 contained a typo causing UXA to fail immediately.]

Release 2.20.10 (2012-10-14)
============================
The last couple of weeks have been fairly retrospective, a dive into
prehistory tidying up the earlier generations which lay languishing as
the core progressed and lead to a number of annoying core bugs being
fixed.

 * Release DRM master earlier during shutdown so switching between
   multiple X servers works automatically.
   https://bugs.freedesktop.org/show_bug.cgi?id=55446

 * Suppress error propagation from DRI2GetMSC and behave as if the pipe
   was simply off to avoid unexpected errors in the clients
   https://bugs.freedesktop.org/show_bug.cgi?id=55395

 * A few fixes to i8xx batch emission, ensuring that the GPU is always
   in a valid state.
   https://bugs.freedesktop.org/show_bug.cgi?id=55455

 * Prevent a use-after-free during UXA shutdown due to inspecting
   the glamor flags after the glamor interface had been freed.

 * Prevent a crash combining TearFree and rotations.
   https://bugs.freedesktop.org/show_bug.cgi?id=55527

 * Correct a missing damage upload along PutImage after using the CPU bo
   as a source for the GPU.
   https://bugs.freedesktop.org/show_bug.cgi?id=55508

 * Fix compilation for older glibc without O_CLOEXEC
   https://bugs.freedesktop.org/show_bug.cgi?id=55577

 * Fix out-of-tree builds failing to recompile the gen4 assemblies
   https://bugs.freedesktop.org/show_bug.cgi?id=55645

 * Fix non-standard build host configuration handling for intel-gen4asm
   https://bugs.freedesktop.org/show_bug.cgi?id=55646

 * Fix a potential batch buffer overflow when replacing the last BLT fill
   operation with a copy
   https://bugs.freedesktop.org/show_bug.cgi?id=55700

 * Flush the render pipeline more frequently on Ironlake as not all
   pipelined state changes are.
   https://bugs.freedesktop.org/show_bug.cgi?id=51422

 * Detect when we need to read the destination for the background raster
   op during fallbacks.
   https://bugs.freedesktop.org/show_bug.cgi?id=55810

 * Avoid a potential deference of an invalid CPU mmap after doing an
   inplace tiled upload.
   https://bugs.freedesktop.org/show_bug.cgi?id=55812

 * Prevent sign extension when packing the upload data for CopyPlane
   https://bugs.freedesktop.org/show_bug.cgi?id=55823

 * Fix some render corruption with a UDL slave output and pageflipping


Release 2.20.9 (2012-09-29)
===========================
And so it came to pass that a critical bug was uncovered in UXA. The
kernel does not like to pageflip when the pipe is off, yet due to the
delayed nature of a pageflip and the relaxed checking performed by UXA,
we could request a pageflip after turning off the display (DPMS). The
kernel rejected that pageflip and the error handling path failed to
restore sanity, and when the screen came back it was stuck on the image
seen before it went to sleep. (Note that there are also some related
kernel bugs, but this update should prevent the most conspicious of the
freezes.) Many thanks to Timo Aaltonen for his efforts in tracking down
the issue.

In other news:

  * Prepare for xorg-1.14, the api is being tweaked again.

  * Handle early FreeScreen in UXA.
    https://bugs.freedesktop.org/show_bug.cgi?id=55346

  * Reenable XvMC support

  * Do not replace the GPU bo when uploading into the shadow/CPU copy
    https://bugs.freedesktop.org/show_bug.cgi?id=54978

  * Fix use of an uninitialised GC when drawing glyphs to a depth=1 pixmap


Release 2.20.8 (2012-09-16)
===========================
Another new small feature, another new release. And a few more bugs
fixed as well! But what is this new feature, do I hear you ask? Why, it
is nothing less than enabling the ValleyView SDV! The lucky person to
have their hands on one will now be able to enjoy X in full TechniColor.

For the rest of us, a few more bugs were fixed with interesting
combinations of software and rendering patterns.

 * Add an extra layer of defence against trying to use a non-GEM device
   with UXA. This should already be taken care of with the new probe,
   but the extra sanity check already existed in the code but was doing
   nothing.
   https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/962892

 * Fix computation of valid CRTCs bitmask for ZaphodHead
   Some systems can only handle certain outputs on certain pipes
   (Screens), and this information was not being propagated through to X
   and randr correctly, breaking valid configurations and not detecting
   invalid configurations correctly.

 * Disable global glyph caching with ZaphodHeads.
   The glyph privates need to be Screen private, but at the moment are
   global leading to conflicts and invalid rendering with multiple heads.
   https://bugs.freedesktop.org/show_bug.cgi?id=54707

 * Prevent direct read back of unmappable buffers
   https://bugs.freedesktop.org/show_bug.cgi?id=54808

 * Tile large uploads whilst replacing the alpha channel
   https://bugs.freedesktop.org/show_bug.cgi?id=54808

 * Correct the source offset when converting a RENDER composite
   operation into a BLT composite operation.
   https://bugs.freedesktop.org/show_bug.cgi?id=54868

 * Correct a minor typo in flattening alphamaps which caused the
   replacement pixmap to often end up with a height of zero.
   https://bugs.gentoo.org/show_bug.cgi?id=434860

 * Don't discard the CPU damage if only part of is being replaced.
   This is most evident when combining software renders like Opera with
   accelerated rendering.
   https://bugs.freedesktop.org/show_bug.cgi?id=54937

Release 2.20.7 (2012-09-08)
===========================
Continuing the flurry of releases, this week saw the release of
xorg-1.13 bringing with it the first steps towards hotpluggable gpu
support and the ability to offload DRI rendering onto other GPUs. In
light of that advance, this release includes the support code by Dave
Airlie to integrate PRIME into xf86-video-intel and make those new
features available.

Aside from landing PRIME, a few other bugs were fixed since 2.20.6:

 * Fix framebuffer leak on server regeneration

 * Fix texture cache flushing on IvyBridge and Kwin with plastique
   https://bugs.freedesktop.org/show_bug.cgi?id=54488

 * Redirect large solid fills on SandyBridge+. By large I mean greater
   than 8192 or 16384 pixels on SandyBridge and IvyBridge respectively.
   https://bugs.freedesktop.org/show_bug.cgi?id=54134

 * Fix up backlight option handling in the manpage and uxa.
   https://bugs.freedesktop.org/show_bug.cgi?id=54397

 * Unbreak ZaphodHeads.
   https://bugs.freedesktop.org/show_bug.cgi?id=52438

Release 2.20.6 (2012-09-02)
===========================
A serious bug that caused a crash on SandyBridge and IvyBridge when
mixing CPU and GPU operations on the same buffer, and an annoyance from
bad scheduling of windowed swapbuffer updates causing low framerates and
jitter. Plus the usual smattering of assertion fixes and a long standing
issue with incoherent page access to a streaming buffer.

 * Low frame rates in Blobby Valley when "fullscreen"
   https://bugs.freedesktop.org/show_bug.cgi?id=54274

 * Incoherent concurrent access with the CPU and GPU
   https://bugs.freedesktop.org/show_bug.cgi?id=51422
   https://bugs.freedesktop.org/show_bug.cgi?id=52299

 * Add Option "Backlight" to override automatic selection of the
   backlight interface.

 * Avoid overwriting the composite operation info when testing if we
   can transfer the operation to the BLT.

Release 2.20.5 (2012-08-26)
===========================
Another silly bug found, another small bugfix release. The goal was for
the driver to bind to all Intel devices supported by the kernel.
Unfortunately we were too successful and started claiming Pouslbo,
Medfield and Cedarview devices which are still encumbered by propietary
IP and not supported by this driver.

Bugs fixed since 2.20.4:

 * Only bind to Intel devices using the i915 kernel module

 * Regression in the bitmap-to-region code, e.g. icewm window buttons
   https://bugs.freedesktop.org/show_bug.cgi?id=53699

Release 2.20.4 (2012-08-18)
===========================
Continuing the small bugfix releases, the only real feature is initial
enabling for Haswell for the purpose of rendering verification and
validation - by no means is it complete!

Bugs fixed since 2.20.3:

  * Some potential errors along failure paths found by a static analyser
  with the help of Zdenek Kablac.

  * Eliminate zero-sized rectangles from PolyFillRectangles as the code
  assumes that they did not exist and so caused corruption.

  * Remove the UXA warning for failing to tile the front buffer if it is
  disallowed by hardware, and so expected.

  * Fix the validation of the XV pipe parameter.

  * Fix 8x8 tiled pattern fills
  https://bugs.freedesktop.org/show_bug.cgi?id=53353

  * Fix compile failure when using --with-builderstring

  * Restore w/a flush for gen4 fill/copy/video, fortunately rare
  operations as at least for fill/copy we prefer to use the BLT.
  https://bugs.freedesktop.org/show_bug.cgi?id=53119

  * Restore preferred use of the RENDER ring for SNB+ DRI copies.

Release 2.20.3 (2012-08-04)
===========================
Just a minor bugfix for gen4 chipsets (965gm, gm45 and friends) that
crept into 2.20.2. As an added bonus, the pessimistic workaround for a
GPU hang on gen4 has been relaxed and the shaders have been overhauled
which should pave the way to eliminating the last of the uncommon CPU
operations, along with immediately realising a small perforamnce
improvement.

Bugs fixed since 2.20.2:

 * Update DPMS bookkeeping after modeset
   https://bugs.freedesktop.org/show_bug.cgi?id=52142

 * Avoid overlapping gpu/cpu damage after ignoring cpu damage in the
   consideration of placement for the operation.

 * Enable acceleration by default on 830gm/845g. The GMCH on this pair
   of chipsets is notoriously incoherent, so the GPU is almost certainly
   going to hang at some point, though unlikely to hang the system and
   should automatically disable acceleration (and thence behave
   identically as if the acceleration was disabled from the start).
   Option "NoAccel" can be used to disable all 2D acceleration and
   Option "DRI" can be used to disable all 3D acceleration.
   https://bugs.freedesktop.org/show_bug.cgi?id=52624

 * Fix vertex bookkeeping for gen4 that was causing corruption in the
   command stream.

Release 2.20.2 (2012-07-27)
===========================
For the last 9 months, since 2.16.901, we have been shipping a driver that
does not work on IvyBridge GT1 systems (HD2500 graphics); we were telling
the GPU to use an invalid number of threads for the pixel shader and this
in turned caused the GPU to hang.

Also fixed since the last release just a few days ago:

* Support for the gmux backlight controller on Apple laptops
  https://bugs.freedesktop.org/show_bug.cgi?id=52423

* Fix X -configure not to list this driver as matching any Intel device,
  just the VGA class devices will do!

* A crash in SNA when repeatedly switching xrandr rotations

* Corruption in SNA observed in kwin on IvyBridge
  https://bugs.freedesktop.org/show_bug.cgi?id=52473

Release 2.20.1 (2012-07-22)
===========================
A week in, grab the brown paper bags, for it is time to reveal a couple
of critical bugs that spoilt the 2.20.0 release.

Firstly we have the restoration of DRI for i810. I am sure that the
solitary user will be overjoyed in a couple of years when a new xserver
is forced upon him. That enjoyment will be short-lived when as no actual
acceleration remains, not even shadow, for the chipset.

Perhaps a little more wildly felt, I hope!, will be that the SNA
fallbacks were broken on 64-bit machines if they required clipping. One
little misplaced cast of a pointer, and the screen is filled with
corruption.

Among the other tweaks this week:

* A bug affecting gen4 handling of trapezoids was fixed, and CPU
  overhead reduced.
  https://bugs.freedesktop.org/show_bug.cgi?id=52158

* A fix for a bug causing corruption of a DRI2 unredirected client
  window that was resized whilst under a compositor.

* Support for snoopable buffers on non-LLC architectures, coming to
  a future kernel. The aim to accelerate transfers between the CPU
  and the GPU, in particular to dramatically improve readback
  performance, and to further minimise clflushes.

* Improvement to the composite performance on GT2 SandyBridge and
  IvyBridge devices, in particular the render copy is significantly
  improved.

* Improved handling for when acceleration is disabled, including
  permitting DRI2 to remain supported even if the X server believes
  the GPU wedged.

* Shadow support was dropped from UXA as it was neither complete nor
  correct, use SNA instead.

Release 2.20.0 (2012-07-15)
===========================
First the big news, a new acceleration method that aims to be faster and
consume far less CPU than UXA is now available for selection at runtime.
This snazzy new architecture can be selected through use of
  Option "AccelMethod" "sna"
in your xorg.conf. Whilst it has been under development for some time, it
has not yet had the same degree of widespread testing of UXA, so tread
lightly. Try it and if you spot anything that can be improved, please do
report a bug.

Otherwise we have the usual smattering of bug fixes for UXA:

 * Use a white source whilst adding glyphs to the glyph mask
   (This fixes blank glyphs if using a font that mixes ARGB and A glyphs.)

 * Avoid fallbacks for glyph-to-dst in e.g. gnome-terminal
   https://bugs.freedesktop.org/show_bug.cgi?id=50508

 * Force unused outputs off when VT switching
   https://bugs.freedesktop.org/show_bug.cgi?id=50772

 * Copy the fbcon across to the Screen pixmap at startup.
   (This patch has been kicking around in the distributions for years.)

 * Many missed malloc failures checks and forgotten frees found by a static
   analyzer. Thanks Zdenek Kabelac!

 * Leak of the back buffer when terminating an application after pageflipping
   https://bugs.freedesktop.org/show_bug.cgi?id=50670

 * Double check that the pipe is on before emitting a WAIT_ON_EVENT.
   In conjunction with an uptodate kernel, this should eliminate any
   hangs when changing resolutions or adding/removing displays.
   https://bugs.freedesktop.org/show_bug.cgi?id=50668

 * Update to new Xorg APIs. Future proofing for the next generation of
   hotplug Xorg display servers.

Many thanks to everyone who has reported a bug and otherwise helped to
improve the driver.

Release 2.19.0 (2012-04-29)
===========================
More stability fixes for UXA and support for another variant of IvyBridge.
Given the severity of the stability fixes, I strongly recommend everybody
to upgrade to 2.19.0.

* Prevent waiting on scanlines whilst not in control of the VT and therefore
  whilst referencing foreign CRTC configurations.

* Pixmap (and bo leak) during fallback glyph composition

* Remove broken acceleration for rendering glyphs directly upon the
  destination pixmap, exposed by cairo-1.12.0 (and coincidentally fix
  another Pixmap leak upon fallback handling).

* Add support for Ivy Bridge GT2 Server chipset [PCI id 0x016a]

* Remove broken damage flushing with CompositeRectangles
  https://bugs.freedesktop.org/show_bug.cgi?id=32547

* Fix crash upon server start with multiple monitors
  https://bugs.freedesktop.org/show_bug.cgi?id=47395

* Fix composition issues resulting from overly aggressive Pixmap reuse
  https://bugs.freedesktop.org/show_bug.cgi?id=47345

Release 2.18.0 (2012-02-24)
===========================
Time passes, a few more bugs have crept out of the woodwork that are a
compelling reason to update.

Bugs fixed in this release (compared to 2.17.0)
-----------------------------------------------

* Limit maximum object size so that all of the source, mask and
  destination can be mapped into the aperture simultaneously by basing the
  limit on the mappable aperture size rather than the size of the total
  GATT.

* Incorrect clipping of polygons
  https://bugs.freedesktop.org/show_bug.cgi?id=43649
  Regression from 2.15.901

* Limit number of VMA cached to avoid hitting the per-process VMA limit
  There still is a residual bug in that we seem to have so many objects
  floating around in the first place and that still leads to exhaustion
  of system limits.
  https://bugs.freedesktop.org/show_bug.cgi?id=43075
  https://bugs.freedesktop.org/show_bug.cgi?id=40066

* Latency in processing user-input during continuous rendering

Release 2.17.0 (2011-11-16)
==============================
A few months have passed, and we have accumulated a surprising number of
bug fixes. Oops! We would strongly encourage everyone to upgrade.

Bugs fixed in this snapshot (compared to 2.16.902)
--------------------------------------------------

* Video clobbering composite batch state
  http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=635953

Snapshot 2.16.902 (2011-11-13)
==============================
This is the second release candidate in preparation for the upcoming
2.17.0 release. We will appreciate any feedback we can get from
testing of this snapshot, and thanks to everyone who tested and reported
upon issues in the last snapshot.

A very old bug demonstrating that nobody has ever used alpha maps, and a
couple of more recent mistakes were found.

Bugs fixed in this snapshot (compared to 2.16.901)
--------------------------------------------------

 * Incorrect reuse of surface bindings within a batch for multiple formats
   https://bugs.freedesktop.org/show_bug.cgi?id=40926

 * Nothing was rendered for text with procedural sources
   https://bugs.freedesktop.org/show_bug.cgi?id=31819

 * Handle fallbacks involving alpha maps

Snapshot 2.16.901 (2011-10-30)
==============================
This is the first release candidate in preparation for the upcoming
2.17.0 release. We will appreciate any feedback we can get from
testing of this snapshot.

The basis of this release are to push out a couple of critical stability
fixes for SandyBridge and IvyBridge. There is very little else to see
here. Those 200+ other commits do not exist...

Bugs fixed in this snapshot (compared to 2.16.0)
--------------------------------------------------

 * Workaround blitter hang on SandyBridge and IvyBridge
   https://bugzilla.kernel.org/show_bug.cgi?id=27892
   https://bugs.freedesktop.org/show_bug.cgi

 * Workaround pipe control issues on SandyBridge

 * Use correct maximum PS thread count on IvyBridge

 * Protect against failed pixmap allocation for XV
   https://bugs.freedesktop.org/show_bug.cgi?id=40439

Release 2.16.0 (2011-08-09)
==============================
A new quarter, a new release! The key feature of this release, looking past
the bug fixes, is the enabling of IvyBridge acceleration. We have also fixed
many bugs and graphical glitches and would encourage everyone to upgrade.

Bugs fixed in this snapshot (compared to 2.15.901)
--------------------------------------------------

* Build fix for xserver-1.7.7

Snapshot 2.15.901 (2011-07-30)
==============================
This is the first release candidate in preparation for the upcoming
2.16.0 release. We will appreciate any feedback we can get from
testing of this snapshot.

The highlight of this snapshot is the full enabling of IvyBridge with
acceleration for Render and Xv, along with handling of the shared render
buffer allocations required for Mesa. Also of note is that deep-color
support is enabled (for all chipsets), which allows you to drive your
30-bit monitor at its native colour depth.

Bugs fixed in this snapshot (compared to 2.15.0)
--------------------------------------------------

* Misuse of the Resource database causing crashes after DRI clients close
  https://bugs.freedesktop.org/show_bug.cgi?id=37700

* Crash on large strings
  https://bugs.freedesktop.org/show_bug.cgi?id=36860

* Incorrect rendering for some core drawing operations
  http://bugs.freedesktop.org/show_bug.cgi?id=28768
  http://bugs.freedesktop.org/show_bug.cgi?id=28798
  http://bugs.freedesktop.org/show_bug.cgi?id=28908
  http://bugs.freedesktop.org/show_bug.cgi?id=29401

* Crash in Xv due to insufficient checks on batch space
  https://bugs.freedesktop.org/show_bug.cgi?id=36319

Release 2.15.0 (2011-04-14)
==============================
We are pleased to announce this major release of the xf86-video-intel
driver, roughly on schedule at 3 months since 2.14.0. With the many bug
fixes in this release, we encourage everyone to upgrade to 2.15.

The priority for this quarter has been simply to be unexciting and stabilise
the driver further, seeking to capitalise upon the improvements elsewhere
in the stack.

Bugs fixed in this snapshot (compared to 2.14.903)
--------------------------------------------------

* Turn off relaxed fencing by default for older chipsets
  This was continuing to destabilize those system, so for the release
  we disabled the feature. If you wish to help us debug this, you can
  re-enable the optimisation with Option "RelaxedFencing" "True".
  Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=36147

* Build fix for xserver-1.7.7

* KDE glitches on SNB
  [Technically fixed in the previous snapshot, but I'm really pleased
   that this got fixed in time for the release!]
  https://bugs.freedesktop.org/show_bug.cgi?id=35808


Snapshot 2.14.903 (2011-04-11)
==============================
This is the third release candidate in preparation for the upcoming
2.15.0 release. We will appreciate any feedback we can get from
testing of this snapshot.

There was a bit of churn since 2.14.902 as a potential fix for a
performance regression was tried but had to reverted when it was found to
cause glitches running Compiz on SandyBridge. Otherwise, there were just a
couple of fixes for building against old xservers and running on an
obscure chipset.

Bugs fixed in this snapshot (compared to 2.14.902)
--------------------------------------------------

* Prevent issuing an invalid scanline wait command
  https://bugs.freedesktop.org/show_bug.cgi?id=35576

* The 946GZ in not a 945, but a 965.
  https://bugs.freedesktop.org/show_bug.cgi?id=35854

* Fix tile sizes for gen2 (finally).

* Allow building of recent dri2 changes against old xservers.


Snapshot 2.14.902 (2011-03-29)
==============================
This is the second release candidate in preparation for the upcoming
2.15.0 release. We will appreciate any feedback we can get from
testing of this snapshot.

As befits testing of release candidates, no major regression was found and
a couple more bugs have been fixed.

Bugs fixed in this snapshot (compared to 2.14.901)
--------------------------------------------------

* Clients disappearing with pending swaps

* Incorrect clipping of Xv output on i915 across extended desktops
  https://bugs.freedesktop.org/show_bug.cgi?id=35346

* Introduction of a LinearFramebuffer option. (Defaults to tiled for
  performance and power saving.)


Snapshot 2.14.901 (2011-03-02)
==============================
This is the first release candidate in preparation for the upcoming
2.15.0 release. We will appreciate any feedback we can get from
testing of this snapshot.

Still no further along my grandiose plans to improve Render performance,
aside from the performance tuning lower in the stack, instead we have had
a steady stream of bug fixes.

Bugs fixed in this snapshot (compared to 2.14.0)
------------------------------------------------

* Green pixels within partially off-screen video playback
  https://bugs.freedesktop.org/show_bug.cgi?id=24767

* Defer creation of the glyph cache to generation startup
  https://bugs.freedesktop.org/show_bug.cgi?id=33412

* Incorrect maximum addresses for video decoder state
  https://bugs.freedesktop.org/show_bug.cgi?id=34017

* Failure to handle oversized temporary surfaces
  https://bugs.freedesktop.org/show_bug.cgi?id=34399

* Relaxed tiling corruption on gen2

* Crash when destroying a foreign DRI drawable
  https://bugs.freedesktop.org/show_bug.cgi?id=34787


Release 2.14.0 (2011-01-07)
===========================
We are pleased to announce this major release of the xf86-video-intel
driver, on schedule at 3 months since 2.13.0. With the many bug fixes
in this release, we encourage everyone to upgrade to 2.14.

The most notable feature of this release is the inclusion of acceleration
support, both RENDER and XVIDEO, for Sandy Bridge; note that this requires
a 2.6.37 kernel. In improving the acceleration code paths to support Sandy
Bridge, we were also able to improve the performance of the general i965+
RENDER acceleration. For example on i3, glyph (aa10 and rgb10) performance
is about 3x faster, as is performing small copies between windows, with the
improvement becoming negligible once you hit around 100 pixels square.


Snapshot 2.13.903 (2010-01-04)
==============================
This is the second release candidate in preparation for the upcoming
2.14.0 release, and if no showstoppers turn up in wider testing will
become the next release. Besides the usual bug fixes, we've included
patches by Mario Kleiner to improve vblank handing which both improve the
timing accuracy and remove a few potential races -- provided you also
have the corresponding fixes in the kernel.

Bug fixes
---------

 * Crash on hot-unpluging with an active fullscreen GL application, e.g. a
   compositing WM or video player
   https://bugs.freedesktop.org/show_bug.cgi?id=32770

 * Freeze upon maximising client-side software renderers, e.g. flash.
   https://bugs.freedesktop.org/show_bug.cgi?id=31367

 * Fix confusion over G35 generation
   https://bugs.freedesktop.org/show_bug.cgi?id=32478


Snapshot 2.13.902 (2010-12-10)
==============================
This is the first release candidate in preparation for the upcoming
2.14.0 release. Sandybridge support should be now be ready for use,
and we will appreciate any feedback we can get from this snapshot.
Improving the code base for Sandybridge should also have had knock
on effects for earlier chips as well, in particular Ironlake and to
a lesser extent i965.

New requirements compared to 2.13
---------------------------------
 * Librdrm >= 2.4.23

Bug fixes
---------

 * Crash after failing to allocate memory
   https://bugs.freedesktop.org/show_bug.cgi?id=31487

 * EFAULT during pwrite
   https://bugs.freedesktop.org/show_bug.cgi?id=29752

 * Mark outputs as on and restore backlight after mode-set

 * A hang with i965+ with newer kernels.


Snapshot 2.13.901 (2010-11-05)
==============================
This is an intermediate snapshot of ongoing driver development. The
primary purpose of this snapshot is to capture some recent
improvements, (particularly in Sandybridge support), for further
testing.

Release 2.13.0 (2010-09-30)
===========================
We are pleased to announce this major release of the xf86-video-intel
driver, on schedule at 3 months since 2.12.0. With the many bug fixes
in this release, we encourage everyone using 2.12 to upgrade to 2.13.

[This release is functionally identical to the earlier 2.12.902
release candidate.]

New requirements compared to 2.12
---------------------------------
 * Librdrm >= 2.4.22

Bug fixes
---------
 * Attempt to fix infinite MI_WAIT_FOR_EVENT while watching video
   https://bugs.freedesktop.org/show_bug.cgi?id=28964

   [Various new checks have been added to the video code here, but the
   bug fix hasn't yet been verified by the original reporter.]

 * Fix buffer-object leak
   https://bugs.freedesktop.org/show_bug.cgi?id=26946

 * Fix memory leak on server reset

 * Fix crash due to unchecked pixmap allocation
   https://bugs.freedesktop.org/show_bug.cgi?id=29187

 * Fix for video artifacts when using dualscreen
   https://bugs.freedesktop.org/show_bug.cgi?id=29213

 * Fix for incorrect characters in gnome-terminal when using compiz
   https://bugs.freedesktop.org/show_bug.cgi?id=28438

 * Fix for hanging, full-screen applications, (flash, compiz, etc.)
   https://bugs.freedesktop.org/show_bug.cgi?id=29584

 * Fix selection of backlight device on multi-GPU systems
   https://bugs.freedesktop.org/show_bug.cgi?id=29273

 * Fix to avoid crash with extremely large glyphs
   https://bugs.freedesktop.org/show_bug.cgi?id=29430

 * Fix for eDP panels incorrectly being given only a single, valid mode
   https://bugs.freedesktop.org/show_bug.cgi?id=30069

 * Fix GPU hang involving clipped SRC copies
   https://bugs.freedesktop.org/show_bug.cgi?id=30120

 * Fix to compile for 1.6 series X server.

 * Fix to retry framebuffer allocation after an initial failure.

 * Fix to disable dri2 after fallbacks are forced on.

Snapshot 2.12.902 (2010-09-28)
==============================
This is the second release candidate in preparation for the upcoming
2.13.0 release. The comes exactly one week after 2.12.902 and includes
only a handful of changes.

One significant change is that the drive now requires libdrm 2.4.22
(or newer), as several people reported compilation failures of
xf86-video-intel 2.12.901 with libdrm 2.4.21.

Other changes include a fix to compile for the 1.6 series X server, a
fix to retry framebuffer allocation after an initial failure, and a
fix to disable dri2 after fallbacks are forced on.

Snapshot 2.12.901 (2010-09-21)
==============================
This is the first release candidate in preparation for the upcoming
2.13.0 release. We will appreciate any feedback we can get from
testing of this snapshot.

Bugs fixed in this snapshot (compared to 2.12.0)
------------------------------------------------
 * Attempt to fix infinite MI_WAIT_FOR_EVENT while watching video
   https://bugs.freedesktop.org/show_bug.cgi?id=28964

   [Various new checks have been added to the video code here, but the
   bug fix hasn't yet been verified by the original reporter.]

 * Fix buffer-object leak
   https://bugs.freedesktop.org/show_bug.cgi?id=26946

 * Fix memory leak on server reset

 * Fix crash due to unchecked pixmap allocation
   https://bugs.freedesktop.org/show_bug.cgi?id=29187

 * Fix for video artifacts when using dualscreen
   https://bugs.freedesktop.org/show_bug.cgi?id=29213

 * Fix for incorrect characters in gnome-terminal when using compiz
   https://bugs.freedesktop.org/show_bug.cgi?id=28438

 * Fix for hanging, full-screen applications, (flash, compiz, etc.)
   https://bugs.freedesktop.org/show_bug.cgi?id=29584

 * Fix selection of backlight device on multi-GPU systems
   https://bugs.freedesktop.org/show_bug.cgi?id=29273

 * Fix to avoid crash with extremely large glyphs
   https://bugs.freedesktop.org/show_bug.cgi?id=29430

 * Fix for eDP panels incorrectly being given only a single, valid mode
   https://bugs.freedesktop.org/show_bug.cgi?id=30069

 * Fix GPU hang involving clipped SRC copies
   https://bugs.freedesktop.org/show_bug.cgi?id=30120

Release 2.12.0 (2010-06-24)
===========================
We are pleased to announce this major release of the xf86-video-intel
2D driver. It contains many correctness and performance improvements
compared to the 2.11 releases. We encourage everyone using 2.11 to
upgrade to 2.12.

[This release contains several bug fixes since the earlier 2.11.901
release candidate---see below for details.]

New requirements compared to 2.11
---------------------------------
 * Libdrm >= 2.4.21

Major performance improvements
------------------------------
There have been many performance improvements targeting the
915G/945G/Pineview graphics chipsets (thank to Chris Wilson!). Areas
improved include:

 * Major improvements to glyph rendering

 * Avoid software fallback when using extended desktops, (for example,
   video playback)

 * Better performance when using large windows, (for example with
   firefox scrolling)

 * Avoiding migration ping-pong with gigantic drawing

The following speedups (measured with cairo-perf-trace/cairo-traces)
capture some of the improvements. These were measured on a Pineview
system with X server 1.8.1. This compares how this 2.12 release
improves performance compared to 2.11.0:

	Trace			Speedup
	-----			-------
	ocitysmap		5.41x speedup
	firefox-talos-gfx       2.41x speedup
	gnome-terminal-vim      2.15x speedup
	poppler                 1.86x speedup
	firefox-planet-gnome	1.43x speedup
	midori-zoomed		1.39x speedup
	swfdec-giant-steps      1.36x speedup
	xfce4-terminal-a1	1.17x speedup
	evolution		1.09x speedup
	swfdec-youtube		1.06x speedup

Other improvements
------------------
Daniel Vetter improved Xvmc and overlay, adding GEM support.

Bug fixes
---------
There have been many conformance improvements targeting the
915G/945G/Pineview graphics chipsets. The rendercheck test suite
passes once again and there has been a significant reduction in the
number of errors detected by the cairo test suite (notably center
sampling and EXTEND_NONE behaviors are fixed).

Other notable bug fixes include:

 * Fix for bug 28446 Garbled fonts with Mathematica
   https://bugs.freedesktop.org/show_bug.cgi?id=28446

 * Fixes for page-flipping and other DRI2-handling bugs, (Thanks Jesse
   Barnes, and Kristian Høgsberg)

 * Avoid corruption when using extended desktops, (for example, video
   playback)

(The bug fixes below are new since the 2.11.901 release candidate)

 * Fix corrupted output when screen rotated
   https://bugs.freedesktop.org/show_bug.cgi?id=28461

 * Fix corrupted rendering in KDE due to missing flush.

 * Fixes i830_uxa_put_image for the following issues:

      Bug 28569 - [i965] IGN's flash-based video player crashes X
      https://bugs.freedesktop.org/show_bug.cgi?id=28569
    
      Bug 28573 - [i965] Fullscreen flash and windowed SDL games fail to
                  update the screen
      https://bugs.freedesktop.org/show_bug.cgi?id=28573

 * Fix visual corruption of scrollbar in Chromium

 * Fix tiling limits to resolve this issue:

      Bug 28497 - Graphics corruption after opening a specific website
      https://bugs.freedesktop.org/show_bug.cgi?id=28497

Snapshot 2.11.901 (2010-06-14)
==============================
This is the first release candidate in preparation for the upcoming
2.12.0 release. We will appreciate any feedback we can get from
testing of this snapshot to improve the 2.12.0 release.

New requirements compared to 2.10
---------------------------------
 * Libdrm >= 2.4.19

Major performance improvements
------------------------------
There have been many performance improvements targeting the
915G/945G/Pineview graphics chipsets (thank to Chris Wilson!). Areas
improved include:

 * Major improvements to glyph rendering

 * Avoid software fallback when using extended desktops, (for example,
   video playback)

 * Better performance when using large windows, (for example with
   firefox scrolling)

 * Avoiding migration ping-pong with gigantic drawing

The following speedups (measured with cairo-perf-trace/cairo-traces)
capture some of the improvements. These were measured on a Pineview
system with a very recent X server, (from git just before 1.8.1). This
compares how this 2.12 release candidate improves performance compared
to 2.11.0:

	Trace			Speedup
	-----			-------
	ocitysmap		5.41x speedup
	firefox-talos-gfx       2.41x speedup
	gnome-terminal-vim      2.15x speedup
	poppler                 1.86x speedup
	firefox-planet-gnome	1.43x speedup
	midori-zoomed		1.39x speedup
	swfdec-giant-steps      1.36x speedup
	xfce4-terminal-a1	1.17x speedup
	evolution		1.09x speedup
	swfdec-youtube		1.06x speedup

Other improvements
------------------
Daniel Vetter improved Xvmc and overlay, adding GEM support.

Bug fixes
---------
There have been many conformance improvements targeting the
915G/945G/Pineview graphics chipsets. The rendercheck test suite
passes once again and there has been a significant reduction in the
number of errors detected by the cairo test suite (notably center
sampling and EXTEND_NONE behaviors are fixed).

Other notable bug fixes include:

 * Fix for bug 28446 Garbled fonts with Mathematica
   https://bugs.freedesktop.org/show_bug.cgi?id=28446

 * Fixes for page-flipping and other DRI2-handling bugs, (Thanks Jesse
   Barnes, and Kristian Høgsberg)

 * Avoid corruption when using extended desktops, (for example, video
   playback)

Release 2.11.0 (2010-03-29)
===========================
New in 2.11: DRI2 and page flipping
-----------------------------------
The most significant new feature of this release is support for new
DRI2 APIs, allowing page flipping to occur for swaps that are
full-screen and not rotated.

Performance improvements in 2.11 compared to 2.10
-------------------------------------------------
Dramatically improved performance of large pixmaps on
memory-constrained hardware, (such as 945), by using tiling.
Note that this fix is new since the most recent release
candidate for this release (2.10.903).

    https://bugs.freedesktop.org/show_bug.cgi?id=25375

Elimination of software fallback with alpha-only pixmap (a fix which
eliminated a full second from the Moblin boot time):

    https://bugs.freedesktop.org/show_bug.cgi?id=26189

Notable bug fixes in 2.11 compared to 2.10
------------------------------------------
Fix for undesired black borders on some images, (caued several
problems with firefox):

    http://bugs.freedesktop.org/show_bug.cgi?id=17933

And other fixes to provide more conformance with existing
software-rendering, (as measures by the cairo test suite), such as the
sampling location for nearest-neighbor sampling.

Other changes
-------------
Eric Anholt and Daniel Vetter both removed large piles of old and
useless code now that the driver requires kernel modesetting
(KMS). This continues to reduce the mainteance burden of the driver,
making it easier to isolate and fix bugs.

Snapshot 2.10.903 (2010-03-22)
==============================
Some notable bug fixes
----------------------
* Fix unpredictable results in page-flipping code due to access of an
  uninitialized variable.

* Two fixes that address a number of long-outstanding failures in the
  cairo test suite:

    Remove coord-adjust for nearest centre-sampling.

    Fill alpha on xrgb images. Closes:

	Bug 17933 - x8r8g8b8 doesn't sample alpha=0 outside surface bounds
	http://bugs.freedesktop.org/show_bug.cgi?id=17933

* Fix a regression introduced in 2.10.902:

    Fatal server error:
    i915_emit_composite_setup: ADVANCE_BATCH:
    under-used allocation 100/104

	Bug 21723 [i915 bisected] rendering makes X crash
	http://bugs.freedesktop.org/show_bug.cgi?id=27123

Other minor fixes (avoid trying to print an error message with a freed
string, set a variable to NULL after freeing), and documentation
updates are also included.

Snapshot 2.10.902 (2010-03-15)
==============================
Some significant bug fixes
--------------------------
Fix video color problems due to YUV plane ordering issue. This fixed a
regression that showed up recently (only in these release candidates).

Fix recent regression leading to corruption under compiz:

  https://bugs.freedesktop.org/show_bug.cgi?id=26814

Further DRI2 improvements/fixes from Mario Kleiner and Jesse Barnes,
(including support for SwapBuffers request with divisor != 0).

Fix build against X server 1.6 branch.

Avoid flooding logs after an error occurs.

And dramatic code cleanups
--------------------------
Eric Anholt removed several cases of old, useless code, (conditions
that could not occur now that we require KMS, etc.).

Daniel Vetter eliminated piles of code by modernizing the XvMC
memory-management and completely removing the old i830_memory
allocator (i830_allocate_memory, i830_free_memory), etc.

Snapshot 2.10.901 (2010-02-26)
==============================
The most significant new feature of this release is support for new
DRI2 APIs, allowing page flipping to occur for swaps that are
full-screen and not rotated.

Some significant bug fixes
--------------------------
* Avoid fallback due to failing to extract pixel value from an
  alpha-only solid, (this fix eliminated 1 second from Mobilin boot
  time).

  https://bugs.freedesktop.org/show_bug.cgi?id=26189

* Handle full-height blits without tearing in CopyRegion

  https://bugs.freedesktop.org/show_bug.cgi?id=22475

Several other fixes and cleanups are included as well, (including the
removal of stale utility code that is now maintained in the separate
intel-gpu-tools module).

Release 2.10.0 (2010-01-04)
===========================
New requirements of 2.10 compared to 2.9
----------------------------------------
 * Linux kernel with kernel-modesetting (KMS)

   All user-modesetting code has now been removed from the driver.
   We highly recommend kernel version 2.6.32 or later.

 * Libdrm >= 2.4.16

New features in 2.10 compared to 2.9
------------------------------------
 * New driver debugging options available in xorg.conf
   (DebugFlushBatches, DebugFlushCaches, DebugWait). See "man intel"
   for more details.

 * Video overlay support with KMS. This currently requires Linux
   2.6.33, but a backport to 2.6.32 is available here:

   http://gitorious.org/daniel-s-linux-stuff/linux-kernel/commits/intel-kms-overlay-for-2.6.32

Notable fixes in 2.10 compared to 2.9
-----------------------------------
 * Fix crash when XRenderComposite is called with a -1 value for
   width/height, (crash at login when using compiz).

   http://bugs.freedesktop.org/show_bug.cgi?id=24724

 * Fix to support larger extended desktops, (such as a 2560x1600 plus a
   1920x1200 monitor).


 * Fix glyph corruption due to insufficient cache flushing:

   https://bugs.freedesktop.org/show_bug.cgi?id=24315

Several other correctness and performance fixes are also included.

Note: The driver code of the 2.10.0 release is identical to that of
the 2.9.99.901 release candidate. The only changes in 2.10.0 compared
to 2.9.99.902 are a minor change to the configure script, and some
small updates to the documentation.

Snapshot 2.9.99.902 (2009-12-10)
================================
This is the second release candidate in preparation for the upcoming
2.10.0 release. We will appreciate any feedback we can get from
testing of this snapshot to improve the 2.10.0 release.

Compared to the previous snapshot, this snapshot now correctly
verifies that libdrm 2.4.16 (or newer) is available. The previous
snapshot also required libdrm 2.4.16 for correct functionality, but
neglected to notify the user of this at configure, compile, or install
time and would instead simply fail to run.

Snapshot 2.9.99.901 (2009-11-30)
================================
This is the first release candidate in preparation for the upcoming
2.10.0 release. We will appreciate any feedback we can get from
testing of this snapshot to improve the 2.10.0 release.

With this snapshot, the xf86-video-intel driver requires kernel
modesetting (KMS) as all of the user modesetting (UMS) support has
been removed from the driver.

Release 2.9.0 (2009-09-28)
==========================
We are pleased to announce the 2.9.0 release of the xf86-video-intel
driver. (If you have been following along at home, this release is
identical to the 2.8.99.902 release candidate other than the version
number).

New features in 2.9 compared to 2.8
-----------------------------------
* Support for the B43 chipset.

Major fixes in 2.9.0 compared to 2.8.0
--------------------------------------
* Multiple fixes to make the driver stable for 8xx chipsets, (855GM,
  865G, etc.). The 2.8 driver series was extremely unstable with many
  of these chipsets.

  https://bugs.freedesktop.org/show_bug.cgi?id=22904 (and many duplicates)
  https://bugs.freedesktop.org/show_bug.cgi?id=22947

* Add support for BACKLIGHT property when using kernel modesetting
  (KMS). This allows backlight adjustment with programs such as
  "xbacklight -set <percentage>" or "xrandr --set BACKLIGHT <value>".

  https://bugs.freedesktop.org/show_bug.cgi?id=20963

* Fix so that "xrandr --scale" works when using KMS.

  https://bugs.freedesktop.org/show_bug.cgi?id=22893

* Fix segfaults of X server when logging out.

  https://bugs.freedesktop.org/show_bug.cgi?id=20516

* Avoid falling back to software for 1-bit alpha-only masks.

  https://bugs.freedesktop.org/show_bug.cgi?id=23184

* Fix pixel sampling position for 8xx chipsets, (fixes some cairo-test
  suite failures).

Snapshot 2.8.99.901 (2009-09-09)
================================
This is the first release candidate in preparation for the upcoming
2.9.0 release. We will appreciate any feedback we can get from testing
of this snapshot to improve the 2.9.0 release.

See the commit log for changes in this release, and developers, please
provide me summaries for any major features in this release that you
think should appear in NEWS and in the 2.9.0 release notes.

Note: We are still investigating failures with 865G chipsets, (these
failures existed in the 2.8 series as well). We are hoping to fix
these failures before the 2.9.0 release.

Release 2.8.0 (2009-07-20)
==========================
We are pleased to present this major release of the xf86-video-intel
driver. This release is very similar to the 2.7.99.902 release
candidate but includes a couple of additional bug fixes, (for bugs
#22760 and @22483).

Compared to the 2.7 releases this driver contains several new features
and many bug fixes. The driver now depends on X server 1.6 or later,
and eliminates several obsolete code paths, (XAA and EXA removed in
favor of UXA, DRI1 support eliminated). The driver certainly will work
best with an i915 module from a recent kernel (2.6.31) and with
kernel-modesetting (KMS, specified by loading i915 with the option
"modeset=1").

New features in 2.8.0 compared to 2.7
-------------------------------------
* Remove XAA/EXA/DRI1 and NoAccel, and only support UXA/DRI2 now
  (requiring xserver 1.6).

* VLD support added into XvMC for Mpeg2, which decreases CPU usage
  when playing video.

Major fixes in 2.8.0 compared to 2.7
------------------------------------
* Fix broken front-buffer rendering
  https://bugs.freedesktop.org/show_bug.cgi?id=19174

* Fix disabling of XvMC disabled
  https://bugs.freedesktop.org/show_bug.cgi?id=20790

* Fix broken VT switch on some machines
  https://bugs.freedesktop.org/show_bug.cgi?id=19578

* Improve performance of trapezoid rendering for UXA
  https://bugs.freedesktop.org/show_bug.cgi?id=21376

* Vblank sync'd GL buffer swap (fixing video tearing under composite)
  https://bugs.freedesktop.org/show_bug.cgi?id=20664

* Fix G41 DRM support
  https://bugs.freedesktop.org/show_bug.cgi?id=21095

* Fix crash on some 8xx
  https://bugs.freedesktop.org/show_bug.cgi?id=18974

Various fixes for GPU hangs, and more...

Snapshot 2.7.99.902 (2009-07-13)
--------------------------------
This is the first release candidate in preparation for the upcoming
2.8.0 release. Most major and critical bugs should be fixed, but some
minor bugs may still be present. We will appreciate any feedback we
can get from testing of this snapshot to improve the 2.8.0 release.

Snapshot 2.7.99.901 (2009-06-10)
--------------------------------
This is the first release candidate in preparation for the upcoming
2.8.0 release. Most critical bugs should be fixed, but some major
bugs may still be present. We will appreciate any feedback we can
get from testing of this snapshot to improve the 2.8.0 release.

Some of the major fixes in this snapshot include:

	* Several fixes for intermittent GPU hangs/crashes, (some of
	  which already appeared in the 2.7.1 release)

	* Fix to avoid X crash when viewing large images in browser

	* Fix X server failure when running old (non-GEM) kernel

	* Fixes for SDVO LVDS mode detection

	* Fix major performance regression of trapezoid rendering
          compared to XAA/EXA

	* New support for tear-free video when using KMS

	* New support for tear-free DRI2 CopyRegion

Snapshot 2.7.99.1 (2009-04-28)
------------------------------
This is a development snapshot very early in the process toward
developing 2.8. There have been some big changes to the code, and
we're anxious to get feedback on these changes as early as possible.

Here is a summary of the biggest changes:

  * Driver now depends on X server 1.6 or later

  * Eliminate XAA and EXA support (in favor of UXA)

  * Eliminate DRI1 support

  * Fixes for running without DRI at all

These code removals represent a deletion of a substantial amount of
code, (and hopefully piles of bugs), as well as reduce the maintenance
effort going forward as the number of combinatorial configurations for
the driver are greatly reduced. This means that users are much more
likely to be running code that has actually been tested, and it will
be much easy for developers to replicate bugs that users experience.

One of the things that would be most useful in testing this release is
to revisit any outstanding bugs that you have previously reported. If
the buggy behavior is gone, (or the bug is no longer relevant---such
as a bug that's specific to XAA only), please feel free to indicate so
in bugzilla or even just close the bug.

If you confirm that the bug is still present, please indicate so in
the bug report. (I was going to ask that you select a 1.7.99 version,
but it looks like bugzilla only has versions for products not
compoenents, while we use a "xorg" product and a "driver/intel"
component.) We definitely want to make any such confirmed bugs a
priority, so it would be nice to have a consistent mechanism to search
for these bugs. Suggestions are welcome on the best approach.

Thanks in advance for any testing or feedback on this snapshot.

Release 2.7.0 (2009-04-15)
--------------------------
Compared to the 2.6 series, 2.7.0 has a large number of bug fixes, but
also a few significant features, such as:

        SDVO-TV support, available on ADD2 card (bug#9992) and
        D945GCLF2 board (bug#17776).

        Basic SDVO-LVDS support

        XV video display without tearing
	[Though this isn't working for all users yet, see
	https://bugs.freedesktop.org/show_bug.cgi?id=21076 ]

	Various fixes for UXA, DRI2, and Kernel modesetting.

We encourage users to use kernel modesetting and UXA acceleration with
this release, which should give the best performance and
robustness. When KMS is available, UXA is the default acceleration
used by the driver, (EXA is the default otherwise).

Known issue:

	Some Linux kernel versions (such as 2.6.29) are known to have
	broken PAT code that causes recent versions of this driver to
	fail, (which can manifest as the X server simply not
	starting). This can be verified by adding the "nopat" option
	to the kernel command-line and seeing the failure go away. We
	hope that newer kernels in the 2.6.29.x as well as 2.6.30 and
	above will have working PAT code.

Some of the most notable bugs fixed in 2.7.0 include:

	[GM45 965GM] bad htotal causes panel startup failure
	https://bugs.freedesktop.org/show_bug.cgi?id=17292

	[xrandr TV] need TV output property control
	https://bugs.freedesktop.org/show_bug.cgi?id=12763

	[TV] "xrandr --set TV_FORMAT" gets BadMatch error
	https://bugs.freedesktop.org/show_bug.cgi?id=16566

	[945 tiling] Low performance due to no A17 workaround
	https://bugs.freedesktop.org/show_bug.cgi?id=16835

	[TV]Flicker when launching applications in the 2.4-branch
	https://bugs.freedesktop.org/show_bug.cgi?id=17405

	[945GM FBC] FBC causes underruns & flicker
	https://bugs.freedesktop.org/show_bug.cgi?id=18651

	[xv] Textured video suffers from tearing
	https://bugs.freedesktop.org/show_bug.cgi?id=19635

	[G45] Random hangs with UXA
	https://bugs.freedesktop.org/show_bug.cgi?id=19734

	[945GM] Any 3D app is slow in resolution higher than 800x600
	with UXA+DRI2, due to tiling
	https://bugs.freedesktop.org/show_bug.cgi?id=19738

	[i915 UXA,EXA] rotation messes display with tiling on
	https://bugs.freedesktop.org/show_bug.cgi?id=20265

	[G45] DRI2/UXA gives solid white instead of transparency
	https://bugs.freedesktop.org/show_bug.cgi?id=20321

	LVDS output not detected
	https://bugs.freedesktop.org/show_bug.cgi?id=20517

	xf86-video-intel-2.6.3: Xv crashes X server
	https://bugs.freedesktop.org/show_bug.cgi?id=20525

	[G965 non-GEM] systray in KDE 4 completely broken
	https://bugs.freedesktop.org/show_bug.cgi?id=20527

	[SDVO-TV]the desktop is teared in four sections on the screen
	https://bugs.freedesktop.org/show_bug.cgi?id=20550

	Intel video driver 2.6.3 crashes with XVideo
	https://bugs.freedesktop.org/show_bug.cgi?id=20563

	[855GM] Xv crash with non-KMS
	https://bugs.freedesktop.org/show_bug.cgi?id=20585

	2.6.99.902 breaks native 1680x1050 mode on TMDS -- EDID miss
	https://bugs.freedesktop.org/show_bug.cgi?id=20594

	[945GM TV] 2.6.99.902 sets a too high CONTRAST-value
	https://bugs.freedesktop.org/show_bug.cgi?id=20670

	[915GM] fail to detect LVDS with new VBT code
	https://bugs.freedesktop.org/show_bug.cgi?id=20752

	[regression i965]tiled output when start X
	https://bugs.freedesktop.org/show_bug.cgi?id=20803

	2.6.99.902: LVDS wrongly detected as disconnected
	https://bugs.freedesktop.org/show_bug.cgi?id=20826

	vt switching fails and crashes X
	https://bugs.freedesktop.org/show_bug.cgi?id=20863

	[HDMI] The screen will flicker when some application runs on
	G45-64
	https://bugs.freedesktop.org/show_bug.cgi?id=20875

	TexturedVideo is offsetted wrongly on dualhead
	https://bugs.freedesktop.org/show_bug.cgi?id=20980

	[EXA] xvideo hang X
	https://bugs.freedesktop.org/show_bug.cgi?id=21027

	[EXA] x11perf performance regression
	https://bugs.freedesktop.org/show_bug.cgi?id=21029

	And many others...