[Intel-gfx] please try patch against hibernate breakage

[Dave Airlie]

>
> I tested your patch against kernel-desktop-3.1.10-18.1.x86_64 (openSUSE
> 12.1). After the 9. hibernate / resume sequence, I got this gpu-hang,
> which I never saw before while resuming without kms running on the
> resuming kernel:
>
> [ 1140.700604] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer
> elapsed... GPU hung
> [ 1140.700611] [drm] capturing error event; look for more information in
> /debug/dri/0/i915_error_state
> [ 1140.705594] [drm:i915_wait_request] *ERROR* i915_wait_request returns
> -11 (awaiting 2925 at 2924, next 2927)
> [ 1142.495454] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer
> elapsed... GPU hung
> [ 1142.495535] [drm:i915_wait_request] *ERROR* i915_wait_request returns
> -11 (awaiting 2927 at 2924, next 2928)
> [ 1142.495597] [drm:i915_reset] *ERROR* GPU hanging too fast, declaring
> wedged!
> [ 1142.495603] [drm:i915_reset] *ERROR* Failed to reset chip.
>
> I attached /debug/dri/0/i915_error_state.
>
> kwin and some other kde processes crashed, too.
>
> Until this GPU hang, I couldn't see any broken files as mentioned here
> (see attachments):
>
> https://bugzilla.novell.com/show_bug.cgi?id=732908
>
>

I've cc'dd intel-gfx, I forgot the first time, maybe they can decode
the error state.

But no corruptions is what I'm after, I've got my laptop to do
hib/resume cycles for 3.5 hrs now without seeing any wierdness.

Dave.
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