[Bug 96878] [Bisected: cc2d0e6][HSW] "GPU HANG" msg after autologin to gnome-session

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96878

            Bug ID: 96878
           Summary: [Bisected: cc2d0e6][HSW] "GPU HANG" msg after
                    autologin to gnome-session
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: idr at freedesktop.org
          Reporter: arek.rusi at gmail.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Created attachment 124984
  --> https://bugs.freedesktop.org/attachment.cgi?id=124984&action=edit
gpu crash dump

hi, dmesg shows me this:
[   28.353961] [drm] stuck on render ring
[   28.354632] [drm] GPU HANG: ecode 7:0:0x85dfbff9, in gnome-shell [597],
reason: Engine(s) hung, action: reset
[   28.354633] [drm] GPU hangs can indicate a bug anywhere in the entire gfx
stack, including userspace.
[   28.354634] [drm] Please file a _new_ bug report on bugs.freedesktop.org
against DRI -> DRM/Intel
[   28.354635] [drm] drm/i915 developers can then reassign to the right
component if it's not a kernel issue.
[   28.354636] [drm] The gpu crash dump is required to analyze gpu hangs, so
please always attach it.
[   28.354637] [drm] GPU crash dump saved to /sys/class/drm/card0/error
[   28.355972] drm/i915: Resetting chip after gpu hang

It's only appear when i try autologin into gnome-session (or budgie.desktop)
right after boot (DM is started automaticaly by systemd).When i start
gdm.service or sddm.servece manually from tty, autologin works. 
When I've tried autologin to another WM like fluxbox or xfce4 it works normally
 without hang.

After this hang, gdm (or sddm) starts again and i can login to gnome.session
and everything works fine. I've found no other trigger to make this happens
again.

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