[Intel-gfx] regression on vanilla kernel "drm/i915: framebuffer compression for pre-GM45"

[Alexey Fisher]

Hallo Barnes,
i just found regression on vanilla kerenl. On my eeepc p1005ha after 
this patch xorg will be heavy loaded with cursor flickering.



commit 8082400327d8d2ca54254b593644942bed0edd25
Author: Jesse Barnes <jbarnes at virtuousgeek.org>
Date:   Thu Sep 10 15:28:06 2009 -0700

     drm/i915: framebuffer compression for pre-GM45

     This patch adds framebuffer compression (good for about ~0.5W power
     savings in the best case) support for pre-GM45 chips.  GM45+ have a 
new,
     more flexible FBC scheme that will be added in a separate patch.

     FBC can't always be enabled: the compressed buffer must be physically
     contiguous and reside in stolen space.  So if you have a large display
     and a small amount of stolen memory, you may not be able to take
     advantage of FBC.  In some cases, a BIOS setting controls how much
     stolen space is available.  Increasing this to 8 or 16M can help.

     Signed-off-by: Jesse Barnes <jbarnes at virtuousgeek.org>
     Signed-off-by: Eric Anholt <eric at anholt.net>