https://bugs.kde.org/show_bug.cgi?id=444420
Bug ID: 444420
Summary: XWayland server started by nested KWin Wayland reports
incorrect refresh rate
Product: kwin
Version: 5.23.1
Platform: Archlinux Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: platform-wayland
Assignee: kwin-bugs-n...@kde.org
Reporter: satt...@pm.me
Target Milestone: ---
SUMMARY
When using KWin Wayland, the XWayland server started by it will have the wrong
refresh rate set. In my case it is 144Hz for a 240Hz monitor. For wayland
itself, the refresh rate is correct.
This bug can be seen when running XWayland apps as well, for example: Chromium
and mpv (with xwayland) will report the display refresh rate as 143Hz. This can
(and does) result in laggy, juddery experience.
STEPS TO REPRODUCE
1. Start KWin Wayland
2. run xrandr or check X apps
OBSERVED RESULT
XWayland is set to the wrong refresh rate (144Hz in my case)
EXPECTED RESULT
XWayland refresh rate should be in sync with the Wayland one (240Hz)
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch Linux 5.23.1
KDE Plasma Version: 5.23.1
KDE Frameworks Version: 5.87.0
Qt Version: 5.15.2
GPU: NVIDIA Turing
ADDITIONAL INFORMATION
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