[Bug 82666] New: [drm] stuck on render ring

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=82666

          Priority: medium
            Bug ID: 82666
                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: cs_gon at yahoo.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 104681
  --> https://bugs.freedesktop.org/attachment.cgi?id=104681&action=edit
/sys/class/drm/card0/error

This happened on a Lenovo X220, using Ubuntu Precise, with LTS-Trusty Kernel
(3.13.0-30) and LTS-Saucy Xorg stack:

[312856.300811] [drm] stuck on render ring
[312856.300815] [drm] stuck on blitter ring
[312856.300817] [drm] GPU crash dump saved to /sys/class/drm/card0/error
[312856.300818] [drm] GPU hangs can indicate a bug anywhere in the entire gfx
stack, including userspace.
[312856.300819] [drm] Please file a new bug report on bugs.freedesktop.org
against DRI -> DRM/Intel
[312856.300820] [drm] drm/i915 developers can then reassign to the right
component if it's not a kernel issue.
[312856.300821] [drm] The gpu crash dump is required to analyze gpu hangs, so
please always attach it.

This is the same hardware and software as in the bug
https://bugs.freedesktop.org/show_bug.cgi?id=82665 , which I reported earlier.
I don't know the exact circumstances. It happened to one of our users and seems
to happen every couple of days.

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