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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 --- - Severe misrendering in Left 4 Dead 2"
href="https://bugs.freedesktop.org/show_bug.cgi?id=64323">64323</a>
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<th>Assignee</th>
<td>nouveau@lists.freedesktop.org
</td>
</tr>
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<th>Summary</th>
<td>Severe misrendering in Left 4 Dead 2
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr>
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<th>OS</th>
<td>Linux (All)
</td>
</tr>
<tr>
<th>Reporter</th>
<td>bryancain3+fdo@gmail.com
</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>git
</td>
</tr>
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<th>Component</th>
<td>Drivers/DRI/nouveau
</td>
</tr>
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<th>Product</th>
<td>Mesa
</td>
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<pre>This should be filed under component "Drivers/Gallium/nouveau", but that
doesn't exist for some reason.
In the nv50 driver, after loading a map in the Left 4 Dead 2 beta, there are
major rendering artifacts that make the game unplayable. Portal shows a
similar problem.
Noticing that stable versions before Mesa 9.1 don't have this problem, I
bisected the regression to this commit:
<a href="http://cgit.freedesktop.org/mesa/mesa/commit/?h=48a45ec24ae74c0">http://cgit.freedesktop.org/mesa/mesa/commit/?h=48a45ec24ae74c0</a>
commit 48a45ec24ae74c00d1487552e94d9f824a428f58
Author: Christoph Bumiller <<a href="mailto:e0425955@student.tuwien.ac.at">e0425955@student.tuwien.ac.at</a>>
Date: Tue Jan 8 16:13:11 2013 +0100
nouveau: improve buffer transfers
Save double memcpy on uploads to VRAM in most cases.
Properly handle FLUSH_EXPLICIT.
Reallocate on DISCARD_WHOLE_RESOURCE to avoid sync.
I don't understand the changes made by this commit well enough to fix the
regression myself. I have an apitrace that can be used to reproduce the issue,
and will comment on this bug with a link to it as soon as I find a good way to
share large (~512 MB) files online.</pre>
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