Comment 24 for bug 946899

Had just the same problem on

LSB Version: core-2.0-amd64:core-2.0-noarch:core-3.0-amd64:core-3.0-noarch:core-3.1-amd64:core-3.1-noarch:core-3.2-amd64:core-3.2-noarch:core-4.0-amd64:core-4.0-noarch
Description: Ubuntu 12.10

In dmesg I found:

[29668.344498] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU hung
[29668.344505] [drm] capturing error event; look for more information in /debug/dri/0/i915_error_state

but in my case no /debug/dri/0/i915_error_state could be found (while the bug-gui-tool asked wether to send the data to launchpad this could be reason for the missing file I think - does it remove the file(s) afterwards?).

The interesting point is that I got in this "state" when trying to watch a railscast episode in the browser and pressed the fullscreen-button. The screen became black so I minimized again and everythink was fine again. Doing this a few times and the exception window came up.
GUI operations are very slow now and and many element won't repaint properly (ie when scrolling).

I used chromium 24.0.1312.56-0ubuntu0.12.10.3 (if it is somehow relevant).

Xorg.log seems to be interesting ((EE) [mi] EQ overflowing…) you can find it attached.

While I have a ASUS Zenbook UX31A my graphics card is

00:02.0 VGA compatible controller [0300]: Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 09) (prog-if 00 [VGA controller])
 Subsystem: ASUSTeK Computer Inc. Device [1043:1517]
 Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
 Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
 Latency: 0
 Interrupt: pin A routed to IRQ 44
 Region 0: Memory at f7800000 (64-bit, non-prefetchable) [size=4M]
 Region 2: Memory at e0000000 (64-bit, prefetchable) [size=256M]
 Region 4: I/O ports at f000 [size=64]
 Expansion ROM at <unassigned> [disabled]
 Capabilities: <access denied>
 Kernel driver in use: i915
 Kernel modules: i915