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    <head>
      <base href="https://bugs.freedesktop.org/" />
    </head>
    <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 --- - [Caicos] corruption in Firefox when editing text"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=67880">67880</a>
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>xorg-driver-ati@lists.x.org
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>[Caicos] corruption in Firefox when editing text
          </td>
        </tr>

        <tr>
          <th>QA Contact</th>
          <td>xorg-team@lists.x.org
          </td>
        </tr>

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

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>luto@mit.edu
          </td>
        </tr>

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

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

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

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

        <tr>
          <th>Product</th>
          <td>xorg
          </td>
        </tr></table>
      <p>
        <div>
        <pre>When editing text in Firefox (e.g. composing in gmail or editing a Trac wiki
page), entire lines of text frequently disappear.  Editing anything on them or
selecting them causes them to reappear.

This happens on two different Caicos (HD 6450) systems.  One is running
gnome-shell on Fedora 19, and the other is running Unity on Ubuntu 13.04.  In
the Fedora system, the driver version is
xorg-x11-drv-ati-7.1.0-5.20130408git6e74aacc5.fc19.x86_64.

The two machines have the same monitors.  xrandr on the F19 system says:

Screen 0: minimum 320 x 200, current 3360 x 1050, maximum 16384 x 16384
HDMI-0 connected primary 1680x1050+0+0 (normal left inverted right x axis y
axis) 473mm x 296mm
   1680x1050      60.0*+
   1280x1024      75.0     60.0  
   1152x864       75.0  
   1024x768       75.1     60.0  
   800x600        75.0     60.3  
   640x480        75.0     60.0  
   720x400        70.1  
DVI-0 connected 1680x1050+1680+0 (normal left inverted right x axis y axis)
473mm x 296mm
   1680x1050      60.0*+
   1280x1024      75.0     60.0  
   1152x864       75.0  
   1024x768       75.1     60.0  
   800x600        75.0     60.3  
   640x480        75.0     60.0  
   720x400        70.1  
VGA-0 disconnected (normal left inverted right x axis y axis)</pre>
        </div>
      </p>
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