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      <base href="https://bugs.freedesktop.org/" />
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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Priority</th>
          <td>medium
          </td>
        </tr>

        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - [GM45] Video corruption on wide desktop"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=65099">65099</a>
          </td>
        </tr>

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

        <tr>
          <th>Summary</th>
          <td>[GM45] Video corruption on wide desktop
          </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>freedesktop-bugs@PaulSD.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>unspecified
          </td>
        </tr>

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

        <tr>
          <th>Product</th>
          <td>xorg
          </td>
        </tr></table>
      <p>
        <div>
        <pre>I have a ThinkPad laptop with a GM45 chipset that I connect to two external
monitors via a Matrox DualHead2Go box.

I recently upgraded from Ubuntu Precise to Raring.  After the upgrade, if I
enable the external monitors using `xrandr --output VGA1 --mode 3840x1200
--right-of LVDS1` or `xrandr --output VGA1 --mode 3840x1200 --left-of LVDS1`,
the external monitors turn on, but the entire screen (including LVDS1) is
corrupted.

Using '--above' or '--below' instead of '--right-of' or '--left-of' does not
cause screen corruption.  Reverting xserver-xorg-video-intel from
2.21.6-0ubuntu4 to 2.20.9-0ubuntu2.1 without making any other changes fixes the
problem (I can use '--right-of' or '--left-of' again without screen
corruption).

I'll submit additional information as I collect it.</pre>
        </div>
      </p>
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