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[Russ Cole <792698@xxxxxxxxxxxxxxxxxx>]

I get exactly the same issue as described above.  Screen just goes blank
(although is responsive i.e. music still plays and can stop with
keyboard) and after a forced reboot logs show:

Jul 12 16:15:19 russLaptop kernel: [27811.780077] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung
Jul 12 16:15:19 russLaptop kernel: [27811.781636] [drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -11 (awaiting 11880249 at 11880136, next 11880250)
Jul 12 16:15:19 russLaptop kernel: [27811.782272] [drm:init_ring_common] *ERROR* render ring initialization failed ctl 00000000 head 00000000 tail 00000000 start 00000000
Jul 12 16:15:20 russLaptop kernel: [27812.415027] [drm:i915_do_wait_request] *ERROR* something (likely vbetool) disabled interrupts, re-enabling

I've now had this several times.

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https://bugs.launchpad.net/bugs/792698

Title:
  GPU hung ERROR => nothing is displayed on screen anymore.

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