[Bug 82755] New: GPU Crash causes font corruption

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=82755

          Priority: medium
            Bug ID: 82755
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: GPU Crash causes font corruption
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: hirner at eeg.tuwien.ac.at
          Hardware: Other
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Intel
           Product: DRI

Created attachment 104805
  --> https://bugs.freedesktop.org/attachment.cgi?id=104805&action=edit
Screenshot of font corruption

I sometimes notice a short interruption where the system is not responsive.
After a few seconds, it's usable again, but graphics in opened windows like the
browser is corrupted (most times, only single font characters are corrupted,
for instance all "9" are replaced by "e" - this is not a single rendering issue
but persists and can even be captured by a screenshot, see attached
screenshot). dmesg shows:

[ 3738.273393] [drm] stuck on render ring
[ 3738.273403] [drm] GPU crash dump saved to /sys/class/drm/card0/error
[ 3738.273404] [drm] GPU hangs can indicate a bug anywhere in the entire gfx
stack, including userspace.
[ 3738.273405] [drm] Please file a _new_ bug report on bugs.freedesktop.org
against DRI -> DRM/Intel
[ 3738.273406] [drm] drm/i915 developers can then reassign to the right
component if it's not a kernel issue.
[ 3738.273407] [drm] The gpu crash dump is required to analyze gpu hangs, so
please always attach it.

Hardware: Lenovo ThinkPad T340s, "Intel Corporation 3rd Gen Core processor
Graphics Controller"
Software: Ubuntu 14.04 LTS

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