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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 - [BYT]Some testdisplay case cause screen flicker on testing branch."
   href="https://bugs.freedesktop.org/show_bug.cgi?id=89401">89401</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>[BYT]Some testdisplay case cause screen flicker on testing branch.
          </td>
        </tr>

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

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

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

        <tr>
          <th>OS</th>
          <td>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>hengx.ding@intel.com
          </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>
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        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=113933" name="attach_113933" title="dmesg">attachment 113933</a> <a href="attachment.cgi?id=113933&action=edit" title="dmesg">[details]</a></span>
dmesg

==System Environment==
--------------------------
Regression: not sure, this issue have about 1/3 change to  reproduce, I'm not
sure whether this issue exists before. 
no-working platforms: BYT

==kernel==
--------------------------
drm-intel-testting/820fa21889d702c70c82e30342154624c7139bb3(2015-02-28)


==Bug detailed description==
-----------------------------
Run the command below, sreen sometimes will start to flicker.
./testdisplay -p 100,100,0,0,100,100

==Reproduce steps==
---------------------------- 
1. ./testdisplay -p 100,100,0,0,100,100</pre>
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