[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 #197 from Josh Glover <jmglov at gmail.com> ---
I am also experiencing this, on a Gentoo system running on a ThinkPad T440s.
I'm not doing anything related to XBMC, simply using xrandr for multihead. The
interesting thing is that DRI works fine on my laptop screen (glxgears reports
60fps, which is the refresh rate of my screen), but breaks when I move a window
trying to use DRI (e.g. Chrome, glxgears) to the external monitor connected to
the mini Display Port output.

I see this stuff in dmesg:

[ 3561.424762] [drm:ring_stuck] *ERROR* Kicking stuck wait on blitter ring
[ 3561.424770] [drm] GPU crash dump saved to /sys/class/drm/card0/error
[ 3561.424772] [drm] GPU hangs can indicate a bug anywhere in the entire gfx
stack, including userspace.
[ 3561.424774] [drm] Please file a _new_ bug report on bugs.freedesktop.org
against DRI -> DRM/Intel
[ 3561.424776] [drm] drm/i915 developers can then reassign to the right
component if it's not a kernel issue.
[ 3561.424778] [drm] The gpu crash dump is required to analyze gpu hangs, so
please always attach it.
[ 3566.422957] [drm:ring_stuck] *ERROR* Kicking stuck wait on blitter ring
[ 3571.425143] [drm:ring_stuck] *ERROR* Kicking stuck wait on blitter ring
[ 3575.423680] [drm:ring_stuck] *ERROR* Kicking stuck wait on blitter ring

Seems like the same issue. I'm trying to downgrade X, mesa, et al., to try and
get the system back in working order.

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