[Intel-gfx] gen6 (SNB) depthbuffer issue with OpenGL games

[Nicolas Kalkhof]

Hi all,

ok I've nailed the issue down to 3.0.0-rc7 and 3.0.0-rc7-git1. I suspect that the changes made in
drivers/gpu/drm/i915/i915_dma.c are the cause of the problem.

http://www.kernel.org/diff/diffview.cgi?file=%2Fpub%2Flinux%2Fkernel%2Fv3.0%2Fsnapshots%2Fpatch-3.0-rc7-git1.bz2;z=14

Any Clues?

Regards
Nic


-----Ursprüngliche Nachricht-----
Von: "Nicolas Kalkhof" <nkalkhof at web.de>
Gesendet: Jul 19, 2011 9:08:26 PM
An: "Ian Romanick" <idr at freedesktop.org>
Betreff: Re: [Intel-gfx] gen6 (SNB) depthbuffer issue with OpenGL games

>Hi Ian,
>
>thx for your reply. ok I give it a try and will report my findings....
>
>regards
>nic
>
>-----Ursprüngliche Nachricht-----
>Von: "Ian Romanick" <idr at freedesktop.org>
>Gesendet: Jul 19, 2011 8:45:53 PM
>An: "Nicolas Kalkhof" <nkalkhof at web.de>
>Betreff: Re: [Intel-gfx] gen6 (SNB) depthbuffer issue with OpenGL games
>
>>-----BEGIN PGP SIGNED MESSAGE-----
>>Hash: SHA1
>>
>>On 07/19/2011 07:58 AM, Nicolas Kalkhof wrote:
>>> Hi there,
>>>
>>> I've experienced a strange depth buffer issue recently with OpenGL games
>>> (see attached screenshots). It seems that the depth buffer fails on some
>>> pixels. This problem was introduced somewhere between
>>> Kernel-3.0.0-rc6-git6 and kernel-3.0.0-rc7. Both xf-86-video-intel and
>>> mesa are latest git.
>>> Could someone please look into it?
>>
>>That's very odd. Any chance you could bisect to find the bad commit?
>>You should be able to just bisect the drivers/gpu/drm directory. I'm a
>>bit suspicious that this is a kernel issue. There were only 5 commits
>>in drivers/gpu/drm from rc6 to rc7, and none of them should affect any
>>Intel GPUs at all.
>>-----BEGIN PGP SIGNATURE-----
>>Version: GnuPG v1.4.11 (GNU/Linux)
>>Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org/
>>
>>iEYEARECAAYFAk4l0OEACgkQX1gOwKyEAw/BWQCfeySgLPcT1bdNxPcTJr/S2aw0
>>vvkAnjS5OJF18pRwrRKaMyG2zoXFqwqB
>>=AiSG
>>-----END PGP SIGNATURE-----
>
>
>___________________________________________________________
>Schon gehört? WEB.DE hat einen genialen Phishing-Filter in die
>Toolbar eingebaut! http://produkte.web.de/go/toolbar
>_______________________________________________
>Intel-gfx mailing list
>Intel-gfx at lists.freedesktop.org
>http://lists.freedesktop.org/mailman/listinfo/intel-gfx


___________________________________________________________
Schon gehört? WEB.DE hat einen genialen Phishing-Filter in die
Toolbar eingebaut! http://produkte.web.de/go/toolbar