[Bug 65526] New: drm:i915_hangcheck_hung

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=65526

          Priority: medium
            Bug ID: 65526
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: drm:i915_hangcheck_hung
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: horsley1953 at gmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

I have no idea if I'm reporting this on the right component or not, but the
dmesg error mentions a dri file, so I picked dri.

I'm using fedora 18, and since the first 3.8 kernel (and now 3.9 as well)
showed up, I've been winding up with my X display disappearing and the text
console showing up, but if I Ctrl-Alt-F2 then Ctrl-Alt-F1 I'm back in X and it
doesn't look like it ever knew it was gone.

That one is hard to reproduce, but then I found a new symptom that is very
similar. When I play a full screen video with mplayer using the -vo gl_nosw
video output option, everything will freeze, 99% of the time within 20 minutes,
after a few seconds the sound starts up again, but the video remains frozen
till I do the same Ctrl-Alt-F2 Ctrl-Alt-F1 trick again, at which point I see
the movie playing just fine again (even has the audio in sync).

Because the movie playing is a reliable way to reproduce this, I finally found
some info in the dmesg output:

[ 1221.110322] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU
hung
[ 1221.110332] [drm] capturing error event; look for more information
in/sys/kernel/debug/dri/0/i915_error_state

I'm guessing it is the recovery from that hang that leaves the video pointing
at the "wrong" frame buffer and the console switch is getting me back to the
right one.

All the files for this (including the error state it mentioned in dmesg) can be
found attached to the fedora bug I initially filed:

https://bugzilla.redhat.com/show_bug.cgi?id=958326

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