[Bug 81402] New: Intermittent non-fatal hangs on i915 chip

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81402

          Priority: medium
            Bug ID: 81402
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: Intermittent non-fatal hangs on i915 chip
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: bugsfreedesktop at emeraldreverie.org
          Hardware: Other
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Intel
           Product: DRI

Created attachment 102879
  --> https://bugs.freedesktop.org/attachment.cgi?id=102879&action=edit
gzipd i915_error_state

I get intermittent hangs of the intel GPU on my laptop, usually every 5-15mins
while gaming, during which Xorg tops out the CPU and the whole window manager
is very slow. This lasts up to a minute before generally returning to normal.
Even low-intensity games like Faster Than Light etc will trigger it, although
it seems to take less time to trigger with more demanding use (e.g. FTL took
nearly 2 hours to trigger it).

Hardware: Dell L702x laptop with i915 chip. Lspci -v reports:
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core
Processor Family Integrated Graphics Controller (rev 09) (prog-if 00 [VGA
controller])
    Subsystem: Dell Device 0571

OS is Archlinux 64bit, running mesa 10.2.3-2 and xf86-video-intel-git
2.99.912.229.ge0523ad-1, although similar behaviour was seen on
xf86-video-intel 2.99.912-2.

Attached is the i915_error_state (gzip'd), the dmesg output, i915 kernel
options, and the Xorg log. I'm currently using Option "AccelMethod" "uxa" in my
Xorg config, although I have also tried "sna" which no difference in results.

Happy to test other xorg config / kernel options / driver patches. Just let me
know.

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