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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 --- - Severe misrendering in Left 4 Dead 2"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=64323">64323</a>
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>nouveau@lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Severe misrendering in Left 4 Dead 2
          </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>bryancain3+fdo@gmail.com
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>x86 (IA32)
          </td>
        </tr>

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

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

        <tr>
          <th>Component</th>
          <td>Drivers/DRI/nouveau
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>Mesa
          </td>
        </tr></table>
      <p>
        <div>
        <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>
        </div>
      </p>
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