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

[Jesse Barnes]

On Fri, 25 Sep 2009 12:57:06 +0200
Alexey Fisher <bug-track at fisher-privat.net> wrote:

> 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>

Can you load drm with debug=1 and send me the output from when i915
loads?

Jesse