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        <tr>
          <th>Priority</th>
          <td>medium
          </td>
        </tr>

        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - GPU HANG: ecode 0:0x9f47f9fd, in chrome [1294], reason: Ring hung"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=83423">83423</a>
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>intel-gfx-bugs@lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>intel-gfx-bugs@lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>GPU HANG: ecode 0:0x9f47f9fd, in chrome [1294], reason: Ring hung
          </td>
        </tr>

        <tr>
          <th>QA Contact</th>
          <td>intel-gfx-bugs@lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>hanno@hboeck.de
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>Other
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>XOrg CVS
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>DRM/Intel
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>DRI
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=105658" name="attach_105658" title="dmesg output after GPU hang">attachment 105658</a> <a href="attachment.cgi?id=105658&action=edit" title="dmesg output after GPU hang">[details]</a></span>
dmesg output after GPU hang

Sometimes on youtube HTML5 videos my screen freezes and then turns black. The
system is still active, I can e.g. reboot it blind by switching to console and
pressing ctrl-alt-del.

This is what dmesg shows:

[  293.705130] [drm] GPU HANG: ecode 0:0x9f47f9fd, in chrome [1294], reason:
Ring hung, action: reset
[  293.705132] [drm] GPU hangs can indicate a bug anywhere in the entire gfx
stack, including userspace.
[  293.705134] [drm] Please file a _new_ bug report on bugs.freedesktop.org
against DRI -> DRM/Intel
[  293.705135] [drm] drm/i915 developers can then reassign to the right
component if it's not a kernel issue.
[  293.705137] [drm] The gpu crash dump is required to analyze gpu hangs, so
please always attach it.
[  293.705139] [drm] GPU crash dump saved to /sys/class/drm/card0/error

I'll attach full dmesg and GPU crash dump.

Further maybe useful info to track down:
System: Thinkpad T61
GPU: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller
(primary) (rev 0c)
Distribution: Gentoo Linux
Kernel: 3.15.6
Mesa: 10.2.6
xf86-video-intel: 2.99.914
xorg-server: 1.16.0</pre>
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