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. -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-intel in Ubuntu. https://bugs.launchpad.net/bugs/805586 Title: i915 Hangcheck timer elapsed... GPU hung To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/805586/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp