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<base href="https://bugs.freedesktop.org/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Performance degradation when one display is in rotation"
href="https://bugs.freedesktop.org/show_bug.cgi?id=93864">93864</a>
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<th>Summary</th>
<td>Performance degradation when one display is in rotation
</td>
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<th>Product</th>
<td>xorg
</td>
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<th>Version</th>
<td>7.7 (2012.06)
</td>
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<th>Hardware</th>
<td>x86 (IA32)
</td>
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<th>OS</th>
<td>Linux (All)
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>major
</td>
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<th>Priority</th>
<td>medium
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<th>Component</th>
<td>Driver/intel
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<th>Assignee</th>
<td>chris@chris-wilson.co.uk
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<th>Reporter</th>
<td>franck.delache@grassvalley.com
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
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<pre>My system has chipset 915GM configured in dual-display. One of the display is
configured in rotation.
I am running a Java application using XRender pipeline which does rendering at
30fps.
With Intel driver 2.99.917, the rendering is fluid and top shows about 30% of
idle CPU.
With Intel driver 2.99.917+git20151217, the rendering is not fluid and top
shows 30% in wa state (0% idle)
I managed to git bisect the culprit commit 9a311f9
sna: Throw away the TearFree damage if it grows too big
Reverting this commit makes the system behave normally (rendering is back to
30fps and CPU is 30% idle).
Note that when both displays are in normal orientation, I do not see any
performance issue.</pre>
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