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      <base href="https://bugs.freedesktop.org/" />
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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 --- - Freezing and drm ring_stuck log errors after latest commit: Enable TearFree rendering for transformed scanouts"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=70764">70764</a>
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>chris@chris-wilson.co.uk
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Freezing and drm ring_stuck log errors after latest commit: Enable TearFree rendering for transformed scanouts
          </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>Linux (All)
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>francisbrwn9@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>git
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>Driver/intel
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>xorg
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Bisected to latest commit: d788b69fdb5ea73b1d283a89e53b2b19eaa90e6e

sna: Enable TearFree rendering for transformed scanouts

On a:
Ubuntu linux saucy
Kernel 3.11.0-12-generic (3.11.3?)
xorg 1.14.3 
SNB: HD3000 mobile

with tearfree enabled by xorg.conf

have X freezing for several seconds at a time and a corresponding error in
kernel log of

[drm:ring_stuck] *ERROR* Kicking stuck semaphore on render ring

occasionally appended by 

[drm] capturing error event; look for more information in
/sys/kernel/debug/dri/0/i915_error_state
[drm:i915_set_reset_status] *ERROR* render ring hung inside bo (0x575a000 ctx
0) at 0x575aa64</pre>
        </div>
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