[Bug 88894] New: System suddenly crashed to blank screen

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88894

            Bug ID: 88894
           Summary: System suddenly crashed to blank screen
           Product: DRI
           Version: XOrg git
          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: john.eure at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 113010
  --> https://bugs.freedesktop.org/attachment.cgi?id=113010&action=edit
GPU crash dump

My laptop's screen suddenly went blank, and the laptop became unresponsive.  I
could not switch to a virtual console, or if I could, it was not able to
display the login prompt on the screen.  Eventually, I stopped waiting and held
down the power button to reboot my laptop.  This worked normally.  After the
reboot, I looked in my syslog, and it told me to: 
"Please file a _new_ bug report on bugs.freedesktop.org against DRI ->
DRM/Intel", and include the GPU crash dump at "/sys/class/drm/card0/error".  
Unfortunately, when I read the GPU crash dump file, it just says "no error
state collected".

In case it's useful, the output of "uname -a" is:

Linux artemis 3.13.0-44-generic #73-Ubuntu SMP Tue Dec 16 00:22:43 UTC 2014
x86_64 x86_64 x86_64 GNU/Linux

And the first bit of the syslog output after the crash, trimmed of headers, is:

Watchdog[16595]: segfault at 0 ip 00007f38da33f428 sp 00007f38ca9c8520 error 6
in libcontent.so[7f38d9a88000+1244000]
Watchdog[16909]: segfault at 0 ip 00007f6a47856428 sp 00007f6a37edf520 error 6
in libcontent.so[7f6a46f9f000+1244000]
[drm] stuck on render ring
[drm] GPU crash dump saved to /sys/class/drm/card0/error
[drm] GPU hangs can indicate a bug anywhere in the entire gfx stack, including
userspace.
[drm] Please file a _new_ bug report on bugs.freedesktop.org against DRI ->
DRM/Intel
[drm] drm/i915 developers can then reassign to the right component if it's not
a kernel issue.
[drm] The gpu crash dump is required to analyze gpu hangs, so please always
attach it.
[drm:i915_set_reset_status] *ERROR* render ring hung inside bo (0x3175000 ctx
0) at 0x3176594
[drm] GMBUS [i915 gmbus vga] timed out, falling back to bit banging on pin 2
[drm:i915_reset] *ERROR* Failed to reset chip.

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