[Bug 63921] [snb] GTT mapping fails after GPU hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=63921

--- Comment #26 from Mika Kuoppala <mika.kuoppala at intel.com> ---
(In reply to comment #25)
> (In reply to comment #23)
> > I work on drm-intel-next[-queued] which is now post-3.10:
> > http://cgit.freedesktop.org/~danvet/drm-intel
> 
> Alright. I guess I'll keep working on 3.9 then (unless you think it's
> important I change) and just backport  your changes. So that if (when) this
> is fixed I have a reasonably stable kernel on which I can run my video
> player :). I'm currently testing with SNA, so hopefully if it crashes it
> will do so in about 30 minutes.
> 
> I already manually backported the changes, compiled and am running. If it
> crashes, I'll report, add the extra fix, recompile and test again.

Just to make sure, there are crashes with and without:

'[ 4366.361686] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed...
GPU hung'

in dmesg?

Please always check the dmesg after crash and report if above line is present
and if it is try to get error state (if we would be so lucky).

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