*** This bug is a duplicate of bug 528467 ***
https://bugs.launchpad.net/bugs/528467
Additional finding:
The problem is reproduced after laptop has put in hibernate mode and then woken.
If the laptop was not in a hibernate mode the problem is not reproduced.
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display freezes, [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer
elapsed... GPU hung
https://bugs.launchpad.net/bugs/507504
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