[Bug 54226] [snb 3.5] stale semaphore sync seqno (typically as seen on bcs->rcs)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=54226

--- Comment #118 from yjcoshc at gmail.com ---
Created attachment 89314
  --> https://bugs.freedesktop.org/attachment.cgi?id=89314&action=edit
i915_error_state (kernel 3.11.6, mesa 9.2.2, xf86-video-intel 2.99.906)

GPU hangs after playing hedgewars for a few minutes. Thinkpad T420 laptop,
i5-2520M.
dmesg error message:
[16901.286432] [drm:i915_hangcheck_elapsed] *ERROR* stuck on render ring
[16901.286441] [drm:i915_hangcheck_elapsed] *ERROR* stuck on blitter ring
[16901.286444] [drm] capturing error event; look for more information in
/sys/kernel/debug/dri/0/i915_error_state
[16908.287504] [drm:i915_hangcheck_elapsed] *ERROR* stuck on render ring
[16908.287508] [drm:i915_hangcheck_elapsed] *ERROR* stuck on blitter ring

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