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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 --- - Flickering shadows in unreleased title trace"
href="https://bugs.freedesktop.org/show_bug.cgi?id=80500">80500</a>
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<th>Assignee</th>
<td>idr@freedesktop.org
</td>
</tr>
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<th>Summary</th>
<td>Flickering shadows in unreleased title trace
</td>
</tr>
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<th>QA Contact</th>
<td>intel-3d-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>
</tr>
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<th>OS</th>
<td>Linux (All)
</td>
</tr>
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<th>Reporter</th>
<td>courtney@lunarg.com
</td>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Version</th>
<td>10.2
</td>
</tr>
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<th>Component</th>
<td>Drivers/DRI/i965
</td>
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<th>Product</th>
<td>Mesa
</td>
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=101697" name="attach_101697" title="Experimental patch that appears to work around flickering shadows issue.">attachment 101697</a> <a href="attachment.cgi?id=101697&action=edit" title="Experimental patch that appears to work around flickering shadows issue.">[details]</a></span>
Experimental patch that appears to work around flickering shadows issue.
Shadows are intermittently disappearing during trace playback. The effect is
random (run to run), but consistent (within a run). We’ve triaged to the point
we believe it has to do with uniform buffer update timing or caching.
Inserting a batch buffer flush only for glBufferSubData with GL_UNIFORM_BUFFER
circumvents the issue, but we do not considered it a fix. It does hack around
it with no performance loss. More research is needed to find real root cause.</pre>
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