Comment 216 for bug 1140716

Hit by the HUNG bug again on Raring. However it's reported differently, so could be the different from the originating one on precise and Quantal.

dmesg
[19492.484182] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU hung
[19492.484186] [drm] capturing error event; look for more information in /debug/dri/0/i915_error_state
Xorg.log(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) [0x7fcb2d7cb476]
(EE) 1: /usr/bin/X (mieqEnqueue+0x26b) [0x7fcb2d7ac78b]
(EE) 2: /usr/bin/X (0x7fcb2d61b000+0x6d472) [0x7fcb2d688472]
(EE) 3: /usr/lib/xorg/modules/input/evdev_drv.so (0x7fcb27aab000+0x5f44) [0x7fcb27ab0f44]
(EE) 4: /usr/bin/X (0x7fcb2d61b000+0x96927) [0x7fcb2d6b1927]
(EE) 5: /usr/bin/X (0x7fcb2d61b000+0xc0328) [0x7fcb2d6db328]
(EE) 6: /lib/x86_64-linux-gnu/libpthread.so.0 (0x7fcb2c71e000+0xfbd0) [0x7fcb2c72dbd0]
(EE) 7: /lib/x86_64-linux-gnu/libc.so.6 (ioctl+0x7) [0x7fcb2b43b747]
(EE) 8: /usr/lib/x86_64-linux-gnu/libdrm.so.2 (drmIoctl+0x28) [0x7fcb2c516338]
(EE) 9: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7fcb29ebd000+0x39010) [0x7fcb29ef6010]
(EE) 10: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7fcb29ebd000+0x3a1f7) [0x7fcb29ef71f7]
(EE) 11: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7fcb29ebd000+0x60d51) [0x7fcb29f1dd51]
(EE) 12: /usr/bin/X (BlockHandler+0x44) [0x7fcb2d677b94]
(EE) 13: /usr/bin/X (WaitForSomething+0x114) [0x7fcb2d7c87f4]
(EE) 14: /usr/bin/X (0x7fcb2d61b000+0x58811) [0x7fcb2d673811]
(EE) 15: /usr/bin/X (0x7fcb2d61b000+0x4757a) [0x7fcb2d66257a]
(EE) 16: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf5) [0x7fcb2b36bea5]
(EE) 17: /usr/bin/X (0x7fcb2d61b000+0x478c1) [0x7fcb2d6628c1]
(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.

repeated 3 times every 100 events dropped till 300

(EE)
(EE) [mi] EQ overflow continuing. 300 events have been dropped.
(EE)
(EE) Backtrace:
(EE) 0: /usr/bin/X (xorg_backtrace+0x36) [0x7fcb2d7cb476]
(EE) 1: /usr/bin/X (0x7fcb2d61b000+0x6d472) [0x7fcb2d688472]
(EE) 2: /usr/lib/xorg/modules/input/evdev_drv.so (0x7fcb27aab000+0x5f44) [0x7fcb27ab0f44]
(EE) 3: /usr/bin/X (0x7fcb2d61b000+0x96927) [0x7fcb2d6b1927]
(EE) 4: /usr/bin/X (0x7fcb2d61b000+0xc0328) [0x7fcb2d6db328]
(EE) 5: /lib/x86_64-linux-gnu/libpthread.so.0 (0x7fcb2c71e000+0xfbd0) [0x7fcb2c72dbd0]
(EE) 6: /lib/x86_64-linux-gnu/libc.so.6 (ioctl+0x7) [0x7fcb2b43b747]
(EE) 7: /usr/lib/x86_64-linux-gnu/libdrm.so.2 (drmIoctl+0x28) [0x7fcb2c516338]
(EE) 8: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7fcb29ebd000+0x39010) [0x7fcb29ef6010]
(EE) 9: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7fcb29ebd000+0x3a1f7) [0x7fcb29ef71f7]
(EE) 10: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7fcb29ebd000+0x60d51) [0x7fcb29f1dd51]
(EE) 11: /usr/bin/X (BlockHandler+0x44) [0x7fcb2d677b94]
(EE) 12: /usr/bin/X (WaitForSomething+0x114) [0x7fcb2d7c87f4]
(EE) 13: /usr/bin/X (0x7fcb2d61b000+0x58811) [0x7fcb2d673811]
(EE) 14: /usr/bin/X (0x7fcb2d61b000+0x4757a) [0x7fcb2d66257a]
(EE) 15: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf5) [0x7fcb2b36bea5]
(EE) 16: /usr/bin/X (0x7fcb2d61b000+0x478c1) [0x7fcb2d6628c1]
(EE)
[ 19491.810] (EE) intel(0): Detected a hung GPU, disabling acceleration.
[ 19491.810] (EE) intel(0): When reporting this, please include i915_error_state from debugfs and the full dmesg.
[ 19491.810] [mi] Increasing EQ size to 512 to prevent dropped events.
[ 19491.810] [mi] EQ processing has resumed after 335 dropped events.
[ 19491.810] [mi] This may be caused my a misbehaving driver monopolizing the server's resources.
[ 19508.772] (II) AIGLX: Suspending AIGLX clients for VT switch
[ 19513.181] (II) Open ACPI successful (/var/run/acpid.socket)
[ 19513.181] (II) AIGLX: Resuming AIGLX clients after VT switch

Linux 3.8.0-22-generic #33-Ubuntu

i915_error_state is clear from ERROR after S3 suspend/resume or because i mounted debugfs only now. Will add it next time this happend.