[Bug 92132] New: GPU hang kills desktop

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92132

            Bug ID: 92132
           Summary: GPU hang kills desktop
           Product: DRI
           Version: XOrg git
          Hardware: x86 (IA32)
                OS: Linux (All)
            Status: NEW
          Severity: minor
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: mustardfiend at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 118460
  --> https://bugs.freedesktop.org/attachment.cgi?id=118460&action=edit
/sys/class/drm/card0/error

Bug description: When the GPU hangs, the computer stops responding to input for
about 10-15 seconds, then kills the desktop and any applications running within
it. The user is left at the Ubuntu login screen. When the user attempts to log
back onto the desktop, the computer tries to bring up the desktop, fails, and
returns to the login screen. 

System environment:
-- system architecture: i686
-- kernel version: 3.13.0-63-generic
-- Linux distribution: Ubuntu 14.04 32-bit
-- Machine or mobo model: Quanta KN1 notebook, Mobile 915GM/PM/GMS/910GML

Reproducing steps: It is unclear what causes this problem. It does not only
occur when using a specific application. The periods between machine restarts
and GPU hangs is seemingly random. The only consistent method known to
reproduce this is to use the computer and wait for it to happen.

Additional info: This is a fairly low priority issue. The machine is old and
not used for anything important, and the problem occurs so infrequently (days
to weeks between restarts) that it has not seriously impacted its utility. 

This problem has occurred on this machine since some time in 2014 (about a year
now). Prior to summer 2015, when the GPU hung, it didn't kill the desktop
completely, but did kill compiz. This left windowed applications open, but
without menu bars or title bars. Attempting to resurrect compiz post-crash
always failed.

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