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<base href="https://bugs.freedesktop.org/" />
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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] Garbage in window after filling backbuffer with glDrawPixels on Mesa-10.1"
href="https://bugs.freedesktop.org/show_bug.cgi?id=77368">77368</a>
</td>
</tr>
<tr>
<th>Assignee</th>
<td>chris@chris-wilson.co.uk
</td>
</tr>
<tr>
<th>Summary</th>
<td>[SNA] Garbage in window after filling backbuffer with glDrawPixels on Mesa-10.1
</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>All
</td>
</tr>
<tr>
<th>Reporter</th>
<td>amonakov@gmail.com
</td>
</tr>
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<th>Hardware</th>
<td>Other
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Component</th>
<td>Driver/intel
</td>
</tr>
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<th>Product</th>
<td>xorg
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=97258" name="attach_97258" title="reproducer">attachment 97258</a> <a href="attachment.cgi?id=97258&action=edit" title="reproducer">[details]</a></span>
reproducer
Starting from 10.1 release, Mesa/i915 has a blit fastpath for glDrawPixels. It
seems to not work properly for some, but not all, users, instead producing a
black window or a window showing contents from elsewhere on the screen. I've
been unable to reproduce it on my hardware.
Software versions on which the problem is observed: Xorg 1.15, xf86-video-intel
2.99.911, Mesa 10.1
So far it's known that UXA is not affected; with SNA: IVB and HSW are affected.
A few users affected by the problem are gathered at
<a href="https://github.com/amonakov/primus/issues/138">https://github.com/amonakov/primus/issues/138</a>; since I couldn't reproduce the
problem I'll encourage them to add themselves to CC here.
A test case is attached. It expects the number of frames to draw as the first
argument (./a.out 1000).</pre>
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