[Bug 59941] New: Frequent GPU hangs since v3.9

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=59941

           Summary: Frequent GPU hangs since v3.9
           Product: Drivers
           Version: 2.5
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - Intel)
        AssignedTo: intel-gfx-bugs at lists.freedesktop.org
        ReportedBy: hyperair at ubuntu.com
                CC: intel-gfx-bugs at lists.freedesktop.org
        Regression: No


Since v3.9, when running Ubuntu 13.04 with the X and Mesa stack from
https://launchpad.net/~xorg-edgers/+archive/ppa, I have been getting frequent
hangs on my Thinkpad E220S running with a Sandy Bridge (8086:0116/Core
i5-2537M) GPU:

[10121.411125] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU
hung
[10121.411131] [drm] capturing error event; look for more information in
/sys/kernel/debug/dri/0/i915_error_state
--
[53978.637042] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU
hung
--
[68285.759379] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU
hung
[68285.759404] [drm:kick_ring] *ERROR* Kicking stuck semaphore on render ring
--
[69825.557728] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU
hung
[69825.557740] [drm] capturing error event; look for more information in
/sys/kernel/debug/dri/0/i915_error_state

In v3.9.x, X would freeze up, and I would have to kill X via Alt+SysRq+K in
order to get out of the situation, but in v3.10 it looks like it's at least
able to unhang itself without crashing X.

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