https://bugs.kde.org/show_bug.cgi?id=443872
Bug ID: 443872
Summary: Inconsistent adaptive sync behavior in KWin Wayland
session
Product: kwin
Version: unspecified
Platform: Debian testing
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: shtetl...@gmail.com
Target Milestone: ---
I just tried Plasma 5.23.0 (built for Debian testing) since it has a number of
major Wayland related bugs fixed, and noticed a problem with adaptive sync.
When running Cyberpunk 2077 game (Wine-staging + vkd3d-proton), framerate
hovers around 70-85 fps in the game for me. Monitor's built in refresh rate
meter shows that adaptive sync is working (most of the time it indeed matches
the framerate fluctuating around 70-85 Hz), but it also periodically jumps to
144 Hz which looks strange, since Mesa HUD which I use with the game to compare
never shows framerate jumping that high and it's my monitor's limit.
In X11 Kwin session I don't see such behavior in the same place in the game and
monitor's built in meter never shows such spikes in refresh rate.
Configuration details:
* Plasma / KWin: 5.23.0
* Display setting for adaptive sync: automatic.
* GPU: Sapphire Pulse RX 6800 XT.
* Display: LG 27GL850 (144 Hz, adaptive sync capable, DisplayPort connection).
* Wine-staging: 6.16 (the game runs in XWayland)
* Wayland: 1.19.0
* XWayland: 1.20.11
* Kernel / amdgpu: 5.14.12
* Mesa: recent main build - 22.0.0-devel (git-d31ca63527)
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