linux-kernel - Re: [BUG] intel KMS bug on i915

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Message-ID: <4B03C0B4.6080300@free.fr>
Date:	Wed, 18 Nov 2009 10:39:00 +0100
From:	Mathieu Taillefumier <mathieu.taillefumier@...e.fr>
To:	Eric Anholt <eric@...olt.net>
CC:	linux-kernel@...r.kernel.org
Subject: Re: [BUG] intel KMS bug on i915

Hello,
> 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)
>    
Thanks for the reply.

I will try to bissect the problem (I have to start from the first rc1 
and go backward from that) but it might take some time since I am not an 
expert in git. What I can say is that the problem occur since the first 
rc of the kernel (and whatever recent version of libdrm). Moreover, I 
have this after a cold boot. Another person reported the same problem on 
the xorg list, so I am not alone :-).

regards

Mathieu

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