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[Lenbok <lenbok@xxxxxxxxx>]

I can repeatably produce this bug on my Intel Sandybridge Core i7-2600.
Symptoms exactly as described. I can often switch to linux console and
kill the process using GL to regain control. Example dmesg:

Sep 18 22:00:10 tron kernel: [  318.861649] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung
Sep 18 22:00:10 tron kernel: [  318.863118] [drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -11 (awaiting 57983 at 57980, next 57984)
Sep 18 22:00:16 tron kernel: [  325.158236] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung
Sep 18 22:00:16 tron kernel: [  325.158313] [drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -11 (awaiting 58725 at 58722, next 58726)
Sep 18 22:00:17 tron kernel: [  325.209242] show_signal_msg: 24 callbacks suppressed
Sep 18 22:00:17 tron kernel: [  325.209245] compiz[1676]: segfault at 0 ip 00007fd4b2684be8 sp 00007ffffd764ad0 error 6 in i965_dri.so[7fd4b2613000+ac000]
Sep 18 22:00:19 tron kernel: [  327.357035] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung
Sep 18 22:00:25 tron kernel: [  333.633635] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung
Sep 18 22:00:25 tron kernel: [  333.633673] [drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -11 (awaiting 59197 at 59194, next 59198)
Sep 18 22:00:31 tron kernel: [  340.190074] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung
Sep 18 22:00:31 tron kernel: [  340.190113] [drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -11 (awaiting 60627 at 60624, next 60628)
Sep 18 22:00:38 tron kernel: [  346.446685] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung
Sep 18 22:00:38 tron kernel: [  346.446720] [drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -11 (awaiting 62241 at 62238, next 62242)
Sep 18 22:00:42 tron kernel: [  351.184113] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung
Sep 18 22:00:42 tron kernel: [  351.184174] [drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -11 (awaiting 62791 at 62783, next 62792)
Sep 18 22:00:42 tron kernel: [  351.184401] [drm:i915_reset] *ERROR* GPU hanging too fast, declaring wedged!
Sep 18 22:00:42 tron kernel: [  351.184405] [drm:i915_reset] *ERROR* Failed to reset chip.
Sep 18 22:00:42 tron kernel: [  351.185368] openscad[2095]: segfault at 0 ip 00007f8003bb07d1 sp 00007fffefdc2de0 error 6 in i965_dri.so[7f8003b3f000+ac000]
Sep 18 22:00:43 tron kernel: [  352.039066] compiz[2109]: segfault at 0 ip 00007f2ff2cb3be8 sp 00007fffac6e2530 error 6 in i965_dri.so[7f2ff2c42000+ac000]
Sep 18 22:00:45 tron kernel: [  353.387006] compiz[2146]: segfault at 0 ip 00007f19bafb3be8 sp 00007fffc900e210 error 6 in i965_dri.so[7f19baf42000+ac000]
Sep 18 22:00:46 tron kernel: [  354.646491] compiz[2163]: segfault at 0 ip 00007f181d840be8 sp 00007ffff170e9d0 error 6 in i965_dri.so[7f181d7cf000+ac000]

Sing out if you need any information to help debug.

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https://bugs.launchpad.net/bugs/805586

Title:
  i915 Hangcheck timer elapsed... GPU hung

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