[Bugme-new] [Bug 17391] New: Hangcheck timer elapsed... GPU hung

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https://bugzilla.kernel.org/show_bug.cgi?id=17391

           Summary: Hangcheck timer elapsed... GPU hung
           Product: Drivers
           Version: 2.5
    Kernel Version: 2.6.35.4
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: Video(DRI - Intel)
        AssignedTo: drivers_video-dri-intel at kernel-bugs.osdl.org
        ReportedBy: eduardo at noticiaslinux.com.br
        Regression: No


Created an attachment (id=28391)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=28391)
dmesg output with GPU hung messages

Following my report on https://bugzilla.kernel.org/show_bug.cgi?id=15671, the
bug still exists in 2.6.35.4 but is much less frequent, which could be due to
my kernel configuration (selecting some kernels options would increase the
occurrence of this bug).

I see that in this 2.6.35.4 release an extra debug message seems to have been
added "[drm:init_ring_common] *ERROR* render ring head not reset to zero ctl
00000000 head 02001000 tail 00000000 start 02001000
[drm:init_ring_common] *ERROR* render ring head forced to zero ctl 00000000
head 00000000 tail 00000000 start 02001000".

Please check the attached dmesg output for the full output.
After that I need to go to a console and "reboot", cause the screen stops
updating on X.

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