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

[Alexey Fisher]

Alexey Fisher schrieb:
> Jesse Barnes schrieb:
>> 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
> 
> Here is it.
> Alexey

With newest xorg driver i do not have this problem. The patch from Brian 
Rogers solves this problem for old driver too.

Regards,
Alexey