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<body><span class="vcard"><a class="email" href="mailto:dennis.mayr.c@gmail.com" title="Dennis Mayr <dennis.mayr.c@gmail.com>"> <span class="fn">Dennis Mayr</span></a>
</span> changed
<a class="bz_bug_link
bz_status_NEW "
title="NEW - Video acceleration *regression* for Radeon Xpress 200M (r300) in xorg-lts-xenial & xorg-lts-wily"
href="https://bugs.freedesktop.org/show_bug.cgi?id=97228">bug 97228</a>
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<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">Version</td>
<td>unspecified
</td>
<td>7.7 (2012.06)
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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - Video acceleration *regression* for Radeon Xpress 200M (r300) in xorg-lts-xenial & xorg-lts-wily"
href="https://bugs.freedesktop.org/show_bug.cgi?id=97228#c3">Comment # 3</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - Video acceleration *regression* for Radeon Xpress 200M (r300) in xorg-lts-xenial & xorg-lts-wily"
href="https://bugs.freedesktop.org/show_bug.cgi?id=97228">bug 97228</a>
from <span class="vcard"><a class="email" href="mailto:dennis.mayr.c@gmail.com" title="Dennis Mayr <dennis.mayr.c@gmail.com>"> <span class="fn">Dennis Mayr</span></a>
</span></b>
<pre>
I've just upgraded the kernel to 4.4.0-34 (lowlatency).
(I've also corrected the Xorg versions; as Ubuntu user, I've fallen into the
bad habit of naming the package versions by the distribution nickname. Sorry.)
Video acceleration works just fine combined with the X server for radeon,
version 7.5, using the r300 driver and DRI2.
Problems begin when using X servers 7.6 and 7.7.
Tearing ensues, regardless of the presence of a xorg.conf config file to
enable/disable options to improve framerate. Enabling DRI3 only worsens the
performance regression, and accentuates tearing.
What I've identified is: both xorg versions support DRI3, and show a
performance regression even if only DRI2 is active. Xorg 7.5 works great for
the r300 driver on the Radeon Xpress 200M onboard chip.
Here are 2 videos: the first is using Xorg 7.5, YouTube fullscreen on Chromium.
The second video is the same, under 7.7 (same problem as 7.6).
7.5: <a href="https://youtu.be/Ykhp2L_pf7Y">https://youtu.be/Ykhp2L_pf7Y</a>
7.7: <a href="https://youtu.be/p7FvXTzlIa0">https://youtu.be/p7FvXTzlIa0</a> (ditto for 7.6)
The regression is evident.</pre>
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