https://bugs.kde.org/show_bug.cgi?id=482064
Bug ID: 482064
Summary: Sluggish Desktop on Plasma 6, swap interval problem
Classification: Plasma
Product: kwin
Version: unspecified
Platform: NixOS
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: sites+kdeb...@vs49688.net
Target Milestone: ---
SUMMARY
After switching to Plasma 6, the desktop is extremely sluggish. This is not the
case on Plasma 5.
Both were running in the Wayland session.
The FPS counter yields that it's only running at 30fps.
"Current FPS: 30 | Maximum FPS 60"
I'm running NixOS with the Apple Silicon patches
(https://github.com/tpwrules/nixos-apple-silicon/blob/main/docs/uefi-standalone.md),
so I initially thought it might be a mesa issue, but considering everything
else works with Plasma 5, I'd be inclined to suspect kwin.
I also tested this with glxgears - also capped at 30. Running "vblank_mode=0
glxgears" causes it to run at full speed, suggesting there's something wrong
with the swap interval.
I've switched back to Plasma 5.27.10 for the moment, but I can switch to 6
again to help debug.
STEPS TO REPRODUCE
1. Be running Plasma 5
2. See Plasma 6 release, get excited
3. Switch to Plasma 6
4. Observe Sluggish Desktop
OBSERVED RESULT
Desktop runs at 30fps.
EXPECTED RESULT
Desktop runs at 60fps.
SOFTWARE/OS VERSIONS
Operating System: NixOS 24.05
KDE Plasma Version: 6.0.0
KDE Frameworks Version: 6.0.0
Qt Version: 6.6.2
Kernel Version: 6.6.0-asahi (64-bit)
Graphics Platform: Wayland
Processors: 4 × Apple Firestorm (M1), 4 × Apple Icestorm (M1)
Memory: 15.3 GiB of RAM
Graphics Processor: Apple M1
Product Name: Apple MacBook Air (M1, 2020)
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