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<th>Priority</th>
<td>medium
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<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - i855gm: Display corruption in presence of graphics memory pressure"
href="https://bugs.freedesktop.org/show_bug.cgi?id=79843">79843</a>
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<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
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<th>Summary</th>
<td>i855gm: Display corruption in presence of graphics memory pressure
</td>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
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<th>OS</th>
<td>Linux (All)
</td>
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<th>Reporter</th>
<td>bonbons67@internet.lu
</td>
</tr>
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<th>Hardware</th>
<td>x86 (IA32)
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Version</th>
<td>XOrg CVS
</td>
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<th>Component</th>
<td>DRM/Intel
</td>
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<th>Product</th>
<td>DRI
</td>
</tr></table>
<p>
<div>
<pre>As determined with the help if Chris, on my i855GM system graphics corruption
seems to be triggered by i915 moving objects to/from GPU memory/aperture.
The corruption is visible either as:
- ghost-screenshot of some previously displayed surface, usually reflowed to
different width
- on some GTK applications, on scroll down by 1 line all the rest of the
surface gets repainted with repetitions of new line (common on hexchat/xchat,
but also mail view pane of claws-mail or pidgin message window). Scroll-up is
not affected.
History of theses corruptions: exist since a long time, show up mostly when
compositing (in Enlightenment, maybe due to fallback to software rendering as E
wants shaders for OpenGL acceleration)
Latest software stack used for testing:
- Kernel "drm-intel-nightly: 2014y-06m-02d-19h-49m-25s" on top of 3.15-rc8
- x11-libs/libdrm-2.4.52
- xf86-video-intel GIT from 31 may 2014
See also mail exchange with Chris:
Message-ID: <<a href="mailto:20140427223402.572010a9@neptune.home">20140427223402.572010a9@neptune.home</a>>
which ended with:
"Hmm. They do suggest that your system is under memory pressure - it has
to move objects in and out the GPU address space regularly - but they
don't suggest that you are out of memory."</pre>
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