https://bugs.kde.org/show_bug.cgi?id=453268
Bug ID: 453268
Summary: KWin's Wayland session limits framerate when
borderless in XWayland applications.
Product: kwin
Version: 5.24.4
Platform: openSUSE RPMs
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
On KWin's Wayland session, the framerate inside XWayland applications gets
limited to the monitor's refresh rate when either setting the window to become
fullscreen or removing its borders through the context menu. This can be seen
with glxgears.
STEPS TO REPRODUCE
1. Run "env vblank_mode=0 __GL_SYNC_TO_VBLANK=0 glxgears"
2. Remove the window borders with the context menu (Alt-F3->More Actions->No
border).
OBSERVED RESULT
The framerate is uncapped until the window borders get removed, then it drops
to the monitor refresh rate.
EXPECTED RESULT
Uncapped framerate
SOFTWARE/OS VERSIONS
OS: openSUSE Tumbleweed
Linux Kernel: 5.17.4-1
KDE Plasma Version: 5.24.4
KDE Frameworks Version: 5.93.0
Qt Version: 5.15.2
ADDITIONAL INFORMATION
I also tested Mutter and wlroots (Wayfire) to reproduce the issue there, both
through a standalone wayland session and nested inside KWin itself, but both
work as expected.
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