[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 #59 from mikhail.v.gavrilov at gmail.com ---
Created attachment 76261
  --> https://bugs.freedesktop.org/attachment.cgi?id=76261&action=edit
i915_error_state (kernel 3.8.2 Fedora) with path (write mbox regs twice on snb,
v2)

"write mbox regs twice on snb, v2" patch also not solve problem.

[ 1399.270341] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU
hung
[ 1399.270345] [drm] capturing error event; look for more information in
/debug/dri/0/i915_error_state
[ 1399.277331] [drm:__gen6_gt_force_wake_get] *ERROR* Timed out waiting for
forcewake old ack to clear.

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