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Synaptics TouchPad driver for XFree86
-------------------------------------
Introduction
------------
This is a driver for the Synaptics TouchPad for XFree86 4.x. A
Synaptics touchpad by default operates in compatibility mode by
emulating a standard mouse. However, by using a dedicated driver, more
advance features of the touchpad becomes available, such as:
- Movement with adjustable, non-linear acceleration and speed.
- Button events through short touching of the touchpad.
- Double-Button events through double short touching of the touchpad.
- Dragging through short touching and holding down the finger on the
touchpad.
- Middle and right button events on the upper and lower corner of
the touchpad.
- Vertical scrolling (button four and five events) through moving
the finger on the right side of the touchpad.
- The up/down button sends button four/five events.
- Horizontal scrolling (button six and seven events) through moving
the finger on the lower side of the touchpad.
- The multi-buttons send button four/five events, and six/seven
events for horizontal scrolling.
- Adjustable finger detection.
- Multifinger taps: two finger for middle button and three finger
for right button events. (Needs hardware support. Not all models
implement this feature.)
- Run-time configuration using shared memory. This means you can
change parameter settings without restarting the X server.
Note that depending on the touchpad firmware, some of these features
might be available even without using the synaptics driver. Note also
that some functions are not available on all touchpad models, because
they need support from the touchpad hardware/firmware. (Multifinger
taps for example.)
Installation
------------
See the INSTALL file for detailed installation instructions.
Compatibility
-------------
The driver has been reported to work on a number of different laptop
computers. See the COMPATIBILITY file for the list. If your computer
is not listed, please let me (petero2@telia.com) know if the driver
works on your computer.
Parameters
----------
The driver behavior can be configured with parameters. These
parameters are options in the InputDevice section in the XFree86
config file. See the INSTALL file for a working example. If you have
the SHMConfig parameter enabled, these parameters can also be changed
at runtime with the synclient program.
Parameter: Type: Description:
Device String Synaptics device
Protocol String "auto-dev" (automatic, default), "psaux" (raw) or
"event" (linux 2.5 kernel events)
SHMConfig Bool switch on/off shared memory for configuration
LeftEdge Int coordinates for left edge
RightEdge Int coordinates for right edge
TopEdge Int coordinates for top edge
BottomEdge Int coordinates for bottom edge
FingerLow Int When finger pressure drops below this value, the
driver counts it as a release.
FingerHigh Int When finger pressure goes above this value, the
driver counts it as a touch.
MaxTapTime Int max. time (in milliseconds) for detecting a tap
MaxTapMove Int max. movement of the finger for detecting a tap
VertScrollDelta Int move distance of the finger for a scroll event
HorizScrollDelta Int move distance of the finger for a scroll event
EdgeMotionSpeed Int edge motion speed when dragging
Repeater String repeater device
MinSpeed Float min. Speed factor
MaxSpeed Float max. Speed factor
AccelFactor Float acceleration factor
UpDownScrolling Bool If on, the up/down buttons generate button 4/5 events.
If off, the up button generates a double click and
the down button generates a button 2 event.
EmulateMidButtonTime Int max time (in milliseconds) for middle button emulation.
TouchpadOff Bool If on, the Touchpad is switched off (useful
if an external mouse is connected)
LockedDrags Bool If off, a tap and drag gesture ends when you release
the finger. If on, the gesture is active until you
tap a second time.
A tap event happens when the finger is touched and released in a time
interval shorter than MaxTapTime, and the touch and release
coordinates are less than MaxTapMove units apart. A "touch" event
happens when the Z value goes above FingerHigh, and an "untouch" event
happens when the Z value goes below FingerLow.
The MinSpeed, MaxSpeed and AccelFactor parameters control the pointer
motion speed. The speed value defines the scaling between touchpad
coordinates and screen coordinates. When moving the finger very
slowly, the MinSpeed value is used, when moving very fast the MaxSpeed
value is used. When moving the finger at moderate speed, you get a
pointer motion speed somewhere between MinSpeed and MaxSpeed. If you
don't want any acceleration, set MinSpeed and MaxSpeed to the same
value.
The MinSpeed, MaxSpeed and AccelFactor parameters don't have any
effect on scrolling speed. Scrolling speed is determined solely from
the VertScrollDelta and HorizScrollDelta parameters.
Since synaptics touchpads don't have a button that corresponds to the
middle button on a mouse, the driver can emulate middle mouse button
events. If you press both the left and right mouse buttons at almost
the same time (no more than EmulateMidButtonTime milliseconds apart)
the driver generates a middle mouse button event.
FAQ
---
* Is this free software?
Yes, the source code is released under the GNU General Public
License.
* How do I use this driver with Linux kernel 2.6.x?
You need kernel 2.6.0-test6 or later and version 0.11.7 or later
of the XFree86 driver. You need to have the "evdev" driver loaded
or compiled into the kernel (CONFIG_INPUT_EVDEV). Set the
"Protocol" parameter in the X configuration file to
"auto-dev". Also, if you set the "Device" parameter to
"/dev/psaux", the same X configuration file should work for a
2.4.x kernel.
When configuring the kernel, enable PS/2 mouse support
(CONFIG_MOUSE_PS2) and synaptics touchpad support
(CONFIG_MOUSE_PS2_SYNAPTICS).
* How can I configure tap-to-click behavior?
If you set MaxTapTime=0 then the touchpad will not use tapping at
all, i.e. touching/tapping will not be taken as a mouse click.
If, instead, you set MaxTapMove=0, then the touchpad will not use
tapping for a single finger tap (left mouse button click) but will
for the two and three finger tap (middle and right button click).
* Why did tap-to-click stop working after I upgraded from an old version?
Time is now measured in milliseconds instead of "number of
packets". In practice, this means that if you are upgrading from
an old version, you need to change MaxTapTime and
EmulateMidButtonTime to make "tap to click" work. Good values are
180 and 75 respectively.
* Gnome scrollbars scroll too much when using tap-to-click. Why?
The MaxTapTime parameter is probably too big. Try setting it to
180. Gnome scrollbars use auto repeat, ie if you press the left
mouse button and keep it pressed, the scroll bar will move until
you release the button. This will lead to problems if the tap time
is longer than the delay before auto repeat starts.
* Can the driver be used together with gpm?
No, not reliably, if you are using a 2.4.x kernel. The gpm driver
and the X driver both try to read data from the touchpad, and if
they try to read at the same time, both drivers see incomplete
data and don't know how to interpret it.
If you are running a 2.6.x kernel though, there should be no
conflict, because the kernel driver will make sure both user space
drivers receive all events from the touchpad.
* How do I compile the driver?
Beginning with version 0.11.8, it should be possible to compile
the driver by simply running "make". This will compile a driver
for XFree86 4.2.x, which will also work for 4.3.x versions of
XFree86.
If you have an older version of XFree86, you will need an
installed X source tree. On an RPM based distribution, you can
build a suitable source tree by installing the XFree86 source RPM
and compile it. For example, in RedHat 9, use the following
commands:
# rpm -vU XFree86-4.3.0-2.src.rpm
# cd /usr/src/redhat/SPECS
# rpmbuild -bb XFree86.spec
Then change the TOP variable in the Makefile to match the version
of XFree86 you are using. In the example above, set
TOP = /usr/src/redhat/BUILD/XFree86-4.3.0/xc
Authors
-------
Many people have contributed to this driver. Look at the top of
synaptics.c and ps2comm.c for details.
The current maintainer is Peter Osterlund <petero2@telia.com>.
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