https://bugs.kde.org/show_bug.cgi?id=445115
Bug ID: 445115
Summary: kwin under wayland drops frames when mousing across
window edges
Product: kwin
Version: 5.23.2
Platform: Ubuntu Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: mich...@michaelmarley.com
Target Milestone: ---
SUMMARY
When running kwin 5.23.2 (and all previous versions that I have tested; this
doesn't appear to be a regression), I have found that moving the mouse across
the edge of a window causes kwin to drop frames. I have reproduced this on
multiple systems with Intel graphics, but I don't have any other brands of GPU
to test. It happens with every version of the graphics stack I have tested, up
to and including kernel 5.15.1, libdrm 2.4.107, mesa 21.3.0-rc4, and wayland
1.19. It affects both native Wayland and xwayland windows. It is reproducible
immediately after the system is booted.
STEPS TO REPRODUCE
1. Start up a KDE wayland session
2. Open glxgears or any other application that produces smooth motion (the bug
happens with all applications, but it is most noticeable with smooth movement)
3. Move the mouse over any windows border on the screen
OBSERVED RESULT
Frames are dropped, resulting in jerky motion
EXPECTED RESULT
No frames should be dropped for smooth motion
SOFTWARE/OS VERSIONS
Linux: 5.15.1
KDE Plasma Version: 5.22.3
KDE Frameworks Version: 5.87.0
Qt Version: 5.12.2
ADDITIONAL INFORMATION
I have uploaded a demonstration video to YouTube (as it is too large to attach
here): https://www.youtube.com/watch?v=ErkFgkioPeg Please watch it in 60fps
for the most effect.
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