[Bug 93960] New: GPU HANG: ecode 7:0: stuck on render ring, gdm won't start X

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93960

            Bug ID: 93960
           Summary: GPU HANG: ecode 7:0: stuck on render ring, gdm won't
                    start X
           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: douglas.bagnall at catalyst.net.nz
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 121451
  --> https://bugs.freedesktop.org/attachment.cgi?id=121451&action=edit
/sys/class/drm/card0/error

This is Ubuntu 15.10 with xserver-xorg-video-intel
2:2.99.917+git20150808-0ubuntu4, kernel 4.2.0-25-generic.
The GPU calls itself "Xeon E3-1200 v3/4th Gen Core Processor Integrated
Graphics Controller".

dmesg:

[  103.762219] [drm] stuck on render ring
[  103.764101] [drm] GPU HANG: ecode 7:0:0x87df7c12, in Xorg [1199], reason:
Ring hung, action: reset
[  103.764103] [drm] GPU hangs can indicate a bug anywhere in the entire gfx
stack, including userspace.
[  103.764103] [drm] Please file a _new_ bug report on bugs.freedesktop.org
against DRI -> DRM/Intel
[  103.764104] [drm] drm/i915 developers can then reassign to the right
component if it's not a kernel issue.
[  103.764104] [drm] The gpu crash dump is required to analyze gpu hangs, so
please always attach it.
[  103.764105] [drm] GPU crash dump saved to /sys/class/drm/card0/error
[  103.766155] drm/i915: Resetting chip after gpu hang

gdm and xdm can't start X but lightdm can.

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