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Date: Sun, 30 Dec 2012 23:53:23 +0100
From: Heinz Diehl <htd@fancy-poultry.org>
To: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>, dri-devel@lists.freedesktop.org,
        linux-kernel@vger.kernel.org, David Airlie <airlied@linux.ie>
Subject: Re: i915: GPU hang
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On 30.12.2012, Guennadi Liakhovetski wrote: 

> Did that and it did work for a while, longer than the average with 3.5. I 
> was already about to write a success report, but then it hung again 
> yesterday. I'm not using this laptop very intensively, so, it is hard to 
> collect statistics.

You could try to reproduce the error by writing a big file e.g.

 dd if=/dev/zero of=deleteme bs=1M count=80000

or similar and watching high definition video on Youtube (1080p) or running a few
instances of glxgears. That triggers a gpu hang in my case after
just a couple of seconds.

In my case, the hang doesn't occur when using SNA (or a kernel < 3.7,
which isn't the case with your bug). I have this in my
xorg.conf:

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

Without this, every 3.7 kernel produces a gpu hang within max. 1 min.