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<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [sna 4500MHD] Glyph corruption, changes with repaint"
href="https://bugs.freedesktop.org/show_bug.cgi?id=67377">67377</a>
</td>
</tr>
<tr>
<th>Assignee</th>
<td>chris@chris-wilson.co.uk
</td>
</tr>
<tr>
<th>Summary</th>
<td>[sna 4500MHD] Glyph corruption, changes with repaint
</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>yumpusamongus@gmail.com
</td>
</tr>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Version</th>
<td>7.7 (2011)
</td>
</tr>
<tr>
<th>Component</th>
<td>Driver/intel
</td>
</tr>
<tr>
<th>Product</th>
<td>xorg
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=83062" name="attach_83062" title="Video of problem">attachment 83062</a> <a href="attachment.cgi?id=83062&action=edit" title="Video of problem">[details]</a></span>
Video of problem
Characters are drawn incorrectly with some small probability on every repaint.
This causes a few characters on screen to be corrupt most of the time, and
makes a rather odd flickering effect when resizing windows. See attached video
for example. Symptoms appear not to be present with bitmap or monospace fonts.
A git bisect suggests the problem appeared here:
<a href="http://cgit.freedesktop.org/xorg/driver/xf86-video-intel/commit/?id=2a59eadf8165bd70780ac16220456c6196ac3ff1">http://cgit.freedesktop.org/xorg/driver/xf86-video-intel/commit/?id=2a59eadf8165bd70780ac16220456c6196ac3ff1</a>
It would seem the glyph mask hack is still needed.
I was able to reproduce the problem with xf86-video-intel 2.21.12 on Xorg 1.12
(Debian Sid) and on Xorg 1.14.99.1-167-gff38bbe, built using the instructions
in the ModularDevelopersGuide.</pre>
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