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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - [SKL]"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=100792">100792</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>[SKL]
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>DRI
          </td>
        </tr>

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

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

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

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

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

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

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

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

        <tr>
          <th>Reporter</th>
          <td>daniel@quora.org
          </td>
        </tr>

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

        <tr>
          <th>CC</th>
          <td>intel-gfx-bugs@lists.freedesktop.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=131028" name="attach_131028" title="Kernel log">attachment 131028</a> <a href="attachment.cgi?id=131028&action=edit" title="Kernel log">[details]</a></span>
Kernel log

Bug description:
Display freeze for ~60s.

System environment:
-- chipset: Skylake
-- system architecture: 64-bit
-- xf86-video-intel: 2:2.99.917+git20160706-1ubuntu1~elementary0.4.1
-- xserver: 1:7.7+13ubuntu3
-- mesa: 12.0.6-0ubuntu0.16.04.1
-- libdrm: 2.4.70-1~ubuntu16.04.1
-- kernel: 4.9.24-040924-generic
-- Linux distribution: Elementary OS based on Ubuntu 16.04.
-- Machine or mobo model: Dell XPS 15 9550
-- Display connector:  Internal eDP1

Reproducing steps:
I experienced this while running a complicated legacy X application.

Additional info:
In another X hang which didn't recover (no extra kernel messages as not a GPU
hang), I saw "blocked rendering commands" in the Xorg log, so could be related.</pre>
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