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<body><span class="vcard"><a class="email" href="mailto:grmat@sub.red" title="grmat@sub.red">grmat@sub.red</a>
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<a class="bz_bug_link
bz_status_NEW "
title="NEW - amdgpu.dc=1 shows performance issues with Xorg compositors when moving windows"
href="https://bugs.freedesktop.org/show_bug.cgi?id=106175">bug 106175</a>
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<td>grmat@sub.red
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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - amdgpu.dc=1 shows performance issues with Xorg compositors when moving windows"
href="https://bugs.freedesktop.org/show_bug.cgi?id=106175#c22">Comment # 22</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - amdgpu.dc=1 shows performance issues with Xorg compositors when moving windows"
href="https://bugs.freedesktop.org/show_bug.cgi?id=106175">bug 106175</a>
from <span class="vcard"><a class="email" href="mailto:grmat@sub.red" title="grmat@sub.red">grmat@sub.red</a>
</span></b>
<pre>Created <span class=""><a href="attachment.cgi?id=140858" name="attach_140858" title="GALLIUM_HUD showing stuttering">attachment 140858</a> <a href="attachment.cgi?id=140858&action=edit" title="GALLIUM_HUD showing stuttering">[details]</a></span>
GALLIUM_HUD showing stuttering
I can confirm the issue.
Having a Radeon R9 290X (Hawaii XT), DC introduces heavy stuttering on a
composited X desktop while interacting with the window manager. This stuttering
can't be resolved by forcing high power states.
Attached is a screenshot to give an impression of the stuttering.
Top left is the GALLIUM_HUD with the compositor's frame rate and frame time
graph. On the right, there is Firefox with the page
<a href="https://testufo.com/photo#photo=quebec.jpg&pps=960&pursuit=0&height=0">https://testufo.com/photo#photo=quebec.jpg&pps=960&pursuit=0&height=0</a> having
hardware acceleration force-enabled and also showing fps/frametime graphs. The
web page has continuous movement, ensures that there is a screen update every
frame and makes it easy to detect stutter.
This looks perfectly fine and the graphs represent that as well.
On the bottom there is the same setup but while changing window focus or moving
a third window around. Firefox stutters as hell (suspecting vsync stuttering)
and the graphs show that as well.
Disabling DC resolves the issue completely and the bottom scenario would look
and feel the same as the upper one with DC.
In this current situation, I could disable DC and have a smooth desktop at the
cost of several dozens of watts idle power or save power and use a stuttering
desktop with DC enabled.</pre>
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