[Bug 91495] New: Periodically video will freeze for no specific reason.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91495

            Bug ID: 91495
           Summary: Periodically video will freeze for no specific reason.
           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: cpollock at embarqmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 117428
  --> https://bugs.freedesktop.org/attachment.cgi?id=117428&action=edit
Xorg GDB backtrace output

Video will freeze for no specific reason and an no particular time interval.
Although it does seem to happen most often when using Facebook or Twitter with
Firefox the freeze today was when I was going to print a webpage from within
Firefox. When the freeze happens all other background processes such as
Fetchmail, Procmail, Postfix and others operate as normal. The freeze today
took place at 15:36:03 CDT and I've noticed in my Syslog that at 16:02:28 there
was this entry:

Jul 28 16:02:28 localhost kernel: [793861.820048] [drm:i915_hangcheck_elapsed
[i915]] *ERROR* Hangcheck timer elapsed... render ring idle

I was able to SSH into the desktop via my tablet and did a reboot from there at
16:10. Running 'cat /sys/class/drm/card0/error showed an output of "no error
state collected".

System Info:

Ubuntu 14.04.2 LTS
Dell Optiplex 780
Kernel 4.0.0-997-generic

I'm also attaching the GDB output of 'backtrace full' for Xorg and Gnome-Shell

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