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<b><a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED - amdgpu.dc=1 shows performance issues with Xorg compositors when moving windows"
href="https://bugs.freedesktop.org/show_bug.cgi?id=106175#c85">Comment # 85</a>
on <a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED - 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:nicholas.kazlauskas@amd.com" title="Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>"> <span class="fn">Nicholas Kazlauskas</span></a>
</span></b>
<pre>(In reply to tempel.julian from <a href="show_bug.cgi?id=106175#c82">comment #82</a>)
<span class="quote">> Could you please try the following?
>
> -disable Plasma compositing with Ctr + Alt + F12 (or in the compositor
> settings and log out and in again)
> -get the latest Compton release by yshui: <a href="https://github.com/yshui/compton">https://github.com/yshui/compton</a>
> -start Compton (Mesa still enables vsync automatically in the latest
> release, this has changed with compton-git)
> -open a Dolphin window and www.vsynctester.com in webbrowser
> -now click Dolphin's title bar, move it a bit, release it and repeat the
> procedure several times in a row
> -there should be stutter happening in the vsynctester.com browser window
>
> -now quit Compton and start it with "vblank_mode=0 compton" to enable GLX
> compositing without vsync
> -now the repeatedly moving Dolphin's window procedure described above
> shouldn't lead to any stutter
> -when booting with amdgpu.dc=0, there also shouldn't be any stutter when
> vsync is kept enabled
>
> My layman impression is that this indicates the problem originating
> somewhere in the xorg/driver space, and not in Plasma or the compositor.</span >
I've tried the setup you've described but I see no stuttering in vsynctester
and no difference with vblank_mode=0. The perf overlay on compton itself looks
stutter free as well. I only see the stuttering doing what you first described
with the dock widgets/tray widgets.</pre>
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