[BUG] intel KMS bug on i915

[Mathieu Taillefumier <mathieu.taillefumier@free.fr>]

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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%.

Best regards

Mathieu



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