[Bug 78901] New: [drm] GPU hang: stuck on blitter ring

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=78901

          Priority: medium
            Bug ID: 78901
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [drm] GPU hang: stuck on blitter ring
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: s.jegen at gmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Intel
           Product: DRI

Created attachment 99321
  --> https://bugs.freedesktop.org/attachment.cgi?id=99321&action=edit
/sys/class/drm/card0/error output

I am on Kernel

Linux 3.15.0-999-generic #201404260253 SMP Sat Apr 26 06:54:32 UTC 2014 x86_64
x86_64 x86_64 GNU/Linux

This bug happened the first time today during regular use having chromium,
terminals and vim open (using the dwm window manager). The XServer seemed to
hang and was not responsive for a few seconds. Soon after it started to react
properly again and the dmesg output suggested to file a new bug report (it may
be a duplicate of bug 75991 however).

Please find the dmesg output, the /sys/class/drm/card0/error output and the
Xorg.0.log attached.

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