[Bug 87453] New: X randomly freezes ("stuck on render ring")

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87453

            Bug ID: 87453
           Summary: X randomly freezes ("stuck on render ring")
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: xfAhqoidntcombh at TrashMail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 111000
  --> https://bugs.freedesktop.org/attachment.cgi?id=111000&action=edit
/sys/class/drm/card0/error, syslog, lshw

The gui on my laptop randomly freezes, about >1 times a week.
The mouse pointer moves, but no any other response to mouse nor keyboard, at
least not in ~20 seconds.
Ctrl-Alt-F3 works, I succeeded to log in, save some log and shut it down.
I noticed a "gpu crash" in syslog.
I attach the reading of /sys/class/drm/card0/error, and some other files.

I do not know whether it is relevant, but:
- I am using an external HDMI monitor (solely, i.e. the laptop's screen this
time is off)
- For a while a new Xubuntu release is available, and I am clicking "Ask me
Later". (Has not done the upgrade yet.)
- Applications I use: Thunderbird, xfce4-terminal, Virtualbox, Firefox, evince

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