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Date: Tue, 18 Dec 2012 00:15:01 +0100
From: Heinz Diehl <htd@fancy-poultry.org>
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Cc: dri-devel@lists.freedesktop.org, Daniel Vetter <daniel.vetter@ffwll.ch>,
        David Airlie <airlied@linux.ie>
Subject: Re: i915: GPU hang
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On 17.12.2012, Guennadi Liakhovetski wrote: 

> [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU hung
> [drm] capturing error event; look for more information in /debug/dri/0/i915_error_state
> [drm:i915_reset] *ERROR* Failed to reset chip.

I have the same problem, are able to reproduce it and have bisected
it, but the commit which git --bisect identified seems not to be the
cause.

root@wildsau linux-git]# git bisect good
6c085a728cf000ac1865d66f8c9b52935558b328 is the first bad commit
commit 6c085a728cf000ac1865d66f8c9b52935558b328
Author: Chris Wilson <ch...@chris-wilson.co.uk>
Date:   Mon Aug 20 11:40:46 2012 +0200

    drm/i915: Track unbound pages


This is a quite nasty (3.7) regression. I have it on all of my three
machines and it drives me mad (3.6.x hangs my USB 3.0 port and 3.7 my
intel graphics).

Try to boot with "i915.i915_enable_rc6=0" and switch to SNA in your
Xorg.conf:

Section "Device"
   Identifier "Card0"
   Driver "intel"
   Option "AccelMethod" "SNA"
EndSection

There are tons of this "GPU hangcheck timer elapsed"
messages on the net...

Good luck!