[Bug 79705] New: [drm] stuck on render ring

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=79705

          Priority: medium
            Bug ID: 79705
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [drm] stuck on render ring
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: mar.kolya at gmail.com
          Hardware: Other
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Intel
           Product: DRI

Created attachment 100490
  --> https://bugs.freedesktop.org/attachment.cgi?id=100490&action=edit
/sys/class/drm/card0/error

I have Ubuntu Trusty (actually Mint based on it), running Mate and Compiz:
uname -a
Linux kolya-laptop 3.13.0-27-generic #50-Ubuntu SMP Thu May 15 18:06:16 UTC
2014 x86_64 x86_64 x86_64 GNU/Linux

lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor
Graphics Controller (rev 09)

I get this in dmesg from time to time:
[176923.802692] [drm] stuck on render ring
[176923.802696] [drm] GPU crash dump saved to /sys/class/drm/card0/error
[176923.802697] [drm] GPU hangs can indicate a bug anywhere in the entire gfx
stack, including userspace.
[176923.802698] [drm] Please file a _new_ bug report on bugs.freedesktop.org
against DRI -> DRM/Intel
[176923.802699] [drm] drm/i915 developers can then reassign to the right
component if it's not a kernel issue.
[176923.802699] [drm] The gpu crash dump is required to analyze gpu hangs, so
please always attach it.

Machine freezes for a bit when this happens. Sometimes some letters on the
screen got garbled - i.e. one particular letter on every window gets rendered
in broken way.

Error contents attached.

Please let me know if I can provide any other information.

Thanks.

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