Re: [BUG] intel KMS bug on i915
From: Mathieu Taillefumier
Date: Wed Nov 18 2009 - 07:54:36 EST
On 11/17/2009 05:54 AM, Eric Anholt wrote:
On Wed, 2009-11-11 at 12:44 +0100, Mathieu Taillefumier wrote:
Hello,
I recently switched to the last git kernel (the rc6) and have a serious
problem with KMS and xorg. I reported it to the xorg list but after some
research it seems that this problem is caused by some recent change in
the intel KMS stack. Some warnings and errors are reported by the
kernel. they are the following (only a small part of it):
[drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung
render error detected, EIR: 0x00000000
i915: Waking up sleeping processes
[drm:i915_wait_request] *ERROR* i915_wait_request returns -5 (awaiting 2
at 1)
[drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung
render error detected, EIR: 0x00000000
This problem is recurrent with all 2.6.32-rc versions and gives rise to
an unusable xorg (independent of the version), while the same xorg stack
works pretty well with the 2.6.31 kernel. The hardware is a sony laptop
with a intel 965 chipset and the bug can be reproduced at 100%
Could you bisect the problem? I don't think I've seen reports of this
(fails at a time other than resume)
I finished my first bisect session but I obtain nothing that can be of
any help so far. I think I just did a mistake somewhere in the process.
I should point that I obtained some back screen during the process but
no messages from the kernel nor xorg that I validated as wrong.
I am also wondering if the first drm commit that implement the dynamic
clock setting is not responsible for it. Is there a way to deactivate it
from the kernel command line or should i revert the commit to test that ?
best
Mathieu
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