NEWS: Add note about broken PAT code in some kernels

Hoping to cut off some false bug reports here.
(cherry picked from commit e1cace16a6130dcdd93965d2329a349d49200fa6)

1 files changed, 10 insertions, 0 deletions

diff --git a/NEWS b/NEWS
index c059c98a..0d0cd8a8 100644
--- a/NEWS
+++ b/NEWS
@@ -19,6 +19,16 @@ 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