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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 - [sna] screen flashes with sna acceleration"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=91472">91472</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>[sna] screen flashes with sna acceleration
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>xorg
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>unspecified
          </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>Driver/intel
          </td>
        </tr>

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

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

        <tr>
          <th>QA Contact</th>
          <td>intel-gfx-bugs@lists.freedesktop.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Thinkpad X1 carbon 2015 model.
Archlinux 
Xorg 1.17.2 
xf86-video-intel 2.99.917+381+g5772556
VGA compatible controller: Intel Corporation Broadwell-U Integrated Graphics
(rev 09)


When configured Xorg with sna AccelMethod,Screen display flashes.
The stuff on monitor moves veryfast from left to right.
There is a screenshot :
<a href="http://www.hacksign.cn/612022797.jpg">http://www.hacksign.cn/612022797.jpg</a>
not only GUI flashes, all tty flash as above situation as well.

It is ok,when configured with uxa AccelMethod, but this accelmethod caused
system slow down when drawingthings on screen.</pre>
        </div>
      </p>
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