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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 --- - AMD SUMO GPU lockup when launching any heavy 3D application"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=56666">56666</a>
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>dri-devel@lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>AMD SUMO GPU lockup when launching any heavy 3D application
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>critical
          </td>
        </tr>

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

        <tr>
          <th>OS</th>
          <td>Linux (All)
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>runetmember@gmail.com
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>x86-64 (AMD64)
          </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/Radeon
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>DRI
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=69423" name="attach_69423" title="AMD SUMO GPU lockup when I launch Unigine Heaven 3">attachment 69423</a> <a href="attachment.cgi?id=69423&action=edit" title="AMD SUMO GPU lockup when I launch Unigine Heaven 3">[details]</a></span>
AMD SUMO GPU lockup when I launch Unigine Heaven 3

GPU lockup happen for me while launching any heavy 3D application on Radeon HD
6620G. For example GPU lockup 100% reproducible when I launch Unigine Heaven 3
(dmesg attached). It also may happen in web-browser, if browser use rendering
hardware acceleration (for example Firefox with enabled
"layers.acceleration.force-enabled" option).
Lockup is not reproducible when I launch same applications on discrete Radeon
HD 6650M GPU using DRI_PRIME feature, so I guess my issue related to AMD SUMO
GPU's (or maybe to more APU's).

Software:
Kubuntu 12.10 x86_64 updated from Xorg Edgers PPA.
Linux 3.7rc3. With Linux 3.5 and 3.6 is also reproducible,
Mesa: 9.1~git20121029.00e6819e
libdrm-radeon1: git20121025.bc494b31
xserver-xorg-video-radeon: git20120928.e8cb0b72
xserver-xorg-core: 1.13.0+git20120920.70e57668
KDE 4.9.2, desktop effects enabled.

Hardware:
Acer Aspire 7560G laptop, BIOS 2.04,
AMD APU A8-3500M with integrated Radeon HD 6620G (SUMO)
Discrete AMD Radeon HD 6650M (TURKS)</pre>
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