[libva] GPU hung

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Hello
Playing recordings with Mythtv 0.25 VAAPI I get 0.05 sec sound, nothing gets
displayed and have the following reproducible error

dmesg.txt:[ 1104.077320] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer
elapsed... GPU hung

Killing mythfrontend does not work. Running intel_reg_dumper, xvinfo, etc.
afterwards hang. System needs rebooting.

This is on SandyBridge 2600K, 1080i HDMI on today's head kernel (>3.5-rc2)
and updated xorg-edgers on Ubuntu 12.04. No xorg.conf.

Please find debugging info in attached problem_gpu_hang.zip (50KB), with
drm.debug=0x06. 

I reported some months ago a GPU hung issue, but didn't receive an answer, I
hope to get a reply this time (I don't mean an immediate fix, but like to
hear that someone will have a look into it in the next days/weeks).
I hope to get this fixed as many new 1080i channels are available, which are
not viewable atm and hope to have better luck with VAAPI. I have a spare
Nvidia GPU with cooler, but like to stick with Intel Onboard GPU as it is
already cooled.

Angela

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