SNB GPU hang

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On stock 3.6.5 at boot+403586.244s, I hit this:

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

At boot+403596.318s, I see in Xorg.0.log:

[mi] Increasing EQ size to 512 to prevent dropped events.
[mi] EQ processing has resumed after 269 dropped events.
[mi] This may be caused my a misbehaving driver monopolizing the
server's resources.
(WW) intel(0): I830DRI2GetMSC:1361 get vblank counter failed: Invalid argument

This was preceded a while before by:

(EE) [mi] EQ overflowing.  Additional events will be discarded until
existing events are processed.
(EE)
(EE) Backtrace:
(EE) 0: /usr/bin/X (xorg_backtrace+0x36) [0x7ffa49022ac6]
(EE) 1: /usr/bin/X (mieqEnqueue+0x26b) [0x7ffa49003eab]
(EE) 2: /usr/bin/X (0x7ffa48e7a000+0x6a492) [0x7ffa48ee4492]
(EE) 3: /usr/lib/xorg/modules/input/evdev_drv.so
(0x7ffa43d7d000+0x5f34) [0x7ffa43d82f34]
(EE) 4: /usr/bin/X (0x7ffa48e7a000+0x936c7) [0x7ffa48f0d6c7]
(EE) 5: /usr/bin/X (0x7ffa48e7a000+0xbce38) [0x7ffa48f36e38]
(EE) 6: /lib/x86_64-linux-gnu/libpthread.so.0 (0x7ffa481a0000+0xfcb0)
[0x7ffa481afcb0]
(EE) 7: /lib/x86_64-linux-gnu/libc.so.6 (ioctl+0x7) [0x7ffa46ef0527]
(EE) 8: /usr/lib/x86_64-linux-gnu/libdrm.so.2 (drmIoctl+0x28) [0x7ffa47f97328]
(EE) 9: /usr/lib/x86_64-linux-gnu/libdrm_intel.so.1
(0x7ffa45970000+0x6af0) [0x7ffa45976af0]
(EE) 10: /usr/lib/x86_64-linux-gnu/libdrm_intel.so.1
(0x7ffa45970000+0x72be) [0x7ffa459772be]
(EE) 11: /usr/lib/xorg/modules/drivers/intel_drv.so
(0x7ffa45b90000+0x18194) [0x7ffa45ba8194]
(EE) 12: /usr/bin/X (0x7ffa48e7a000+0x5130f) [0x7ffa48ecb30f]
(EE) 13: /usr/bin/X (0x7ffa48e7a000+0x55a51) [0x7ffa48ecfa51]
(EE) 14: /usr/bin/X (0x7ffa48e7a000+0x4456a) [0x7ffa48ebe56a]
(EE) 15: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xed)
[0x7ffa46e2576d]
(EE) 16: /usr/bin/X (0x7ffa48e7a000+0x448ad) [0x7ffa48ebe8ad]
(EE)
(EE) [mi] These backtraces from mieqEnqueue may point to a culprit
higher up the stack.
(EE) [mi] mieq is *NOT* the cause.  It is a victim.
(EE) [mi] EQ overflow continuing.  100 events have been dropped.

Have you guys seen this before? Hardware is SNB; just in GNOME3 UI
with terminals, text editors, PDFs, mail and firefox.

Full logs are at:
http://quora.org/2012/i915/i915_error_state
http://quora.org/2012/i915/dmesg
http://quora.org/2012/i915/Xorg.0.log

Box is still booted, but X restarted in case further detail in
/sys/kernel/debug/i915 is useful...

Thanks,
  Daniel
--
Daniel J Blueman


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