[Bug 67092] New: i915 hangs

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=67092

          Priority: medium
            Bug ID: 67092
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: i915 hangs
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: mkj at gotu.dk
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 82694
  --> https://bugs.freedesktop.org/attachment.cgi?id=82694&action=edit
grep'ed dmesg

After I upgraded from 3.7 kernel to 3.8+ kernels, my GPU have started hanging
itself. Sometimes it recovers, sometimes it doesnt. Sometimes it recovers after
a single "kick" sometimes after 4-5 kicks.

I upgraded the Xorg intel driver from 2.20.13 to 2.21.12 because I wasnt even
able to resize accelerated windows without hangs. But it still hangs sometimes
when running something accelerated (VLC, some game).

I also get 2 new errors in my dmesg after i upgraded from kernel 3.7.
>From kernel 3.8 I get:

 [drm] GMBUS [i915 gmbus dpb] timed out, falling back to bit banging on pin 5

>From kernel 3.9 and 3.10 I get:

 [drm] Wrong MCH_SSKPD value: 0x16040307
 [drm] This can cause pipe underruns and display issues.
 [drm] Please upgrade your BIOS to fix this.

I'm running up-to-date Gentoo + a few keyworded packages on a Thinkpad T420.

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