[Bug 101621] New: Login screen running in low graphics mode after wake from suspend.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101621

            Bug ID: 101621
           Summary: Login screen running in low graphics mode after wake
                    from suspend.
           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: rimcaw at zoho.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 132297
  --> https://bugs.freedesktop.org/attachment.cgi?id=132297&action=edit
GPU crash dump saved to /sys/class/drm/card0/error

I was asked to create a new bug since bug 100370 has been closed:
https://bugs.freedesktop.org/show_bug.cgi?id=100370#c4

Currently everytime the machine wakes from suspend, the login screen appears
but it does not work. I wait a little.
Sometimes it blinks and the login screen comes back to normal (I can type my
password in the login box, wifi is connected in the network menu).
    But sometimes, a message about "runnning in low graphics mode" appears. It
is possible to click OK and then the normal login screen comes back -- it may
be necessary to click OK more than once.

This is on Ubuntu 16.04.2

--
Reminder of dmesg:

[50157.082931] [drm] GPU HANG: ecode 7:0:0x86ffbff9, in Xorg [11890], reason:
Hang on render ring, action: reset
[50157.082933] [drm] GPU hangs can indicate a bug anywhere in the entire gfx
stack, including userspace.
[50157.082933] [drm] Please file a _new_ bug report on bugs.freedesktop.org
against DRI -> DRM/Intel
[50157.082934] [drm] drm/i915 developers can then reassign to the right
component if it's not a kernel issue.
[50157.082934] [drm] The gpu crash dump is required to analyze gpu hangs, so
please always attach it.
[50157.082935] [drm] GPU crash dump saved to /sys/class/drm/card0/error
[50157.082990] drm/i915: Resetting chip after gpu hang

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