[Bug 85768] New: Ring hung, action: reset

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85768

            Bug ID: 85768
           Summary: Ring hung, action: reset
           Product: xorg
           Version: 7.7 (2011)
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: smueller at chronox.de
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

I see the following error in dmesg:

[14523.006746] [drm] stuck on render ring
[14523.008567] [drm] GPU HANG: ecode 0:0x0fdf00ac, in Xorg.bin [1505], reason:
Ring hung, action: reset
[14523.008577] [drm] GPU hangs can indicate a bug anywhere in the entire gfx
stack, including userspace.
[14523.008582] [drm] Please file a _new_ bug report on bugs.freedesktop.org
against DRI -> DRM/Intel
[14523.008587] [drm] drm/i915 developers can then reassign to the right
component if it's not a kernel issue.
[14523.008592] [drm] The gpu crash dump is required to analyze gpu hangs, so
please always attach it.
[14523.008597] [drm] GPU crash dump saved to /sys/class/drm/card0/error

I have the error file saved, but it is big and therefore I did not add it here.
I can certainly make it available though.

System behavoir:

- sometimes upon resume from suspend to RAM: it takes about 5 seconds longer to
wake up, but no more obvious problems

- trying to play a video is unsuccessful: no video rendered, sound is played,
X.org becomes unusable (very very slow reaction: switching to another window >
30 seconds), but the system is alive; switching to a console and killing the
video player process does not help, the system is still slow; only a reboot
helps; when shutting down, the screen flickers

- when logging out and sddm tries to show the logon display, screen flickers
for about 30 secs before sddm is shown; no obvious problems afterwards

Software: Fedora 21 beta (not tested with earlier versions)

Hardware:
Lenovo Yoga Pro 3
Intel Broadwell CPU
No additional GPU other than the Broadwell included GPU
3200x1800 screen resolution

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