Bug 476570

Summary:	Bad frametime with Nvidia 545.29.02 on X11
Product:	[Plasma] kwin	Reporter:	duncanyoyo1
Component:	compositing	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED UPSTREAM
Severity:	normal	CC:	riku, xaver.hugl
Priority:	NOR
Version First Reported In:	5.27.9
Target Milestone:	---
Platform:	Arch Linux
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description duncanyoyo1 2023-11-05 04:00:09 UTC

SUMMARY

Since updating to 545.29.03 kwin seems to have bad frametimes, making everything seem stuttery or laggy.

There are moments where it will be smooth, but then it goes right back to stuttering. 

***
NOTE: If you are reporting a crash, please try to attach a backtrace with debug symbols.
See https://community.kde.org/Guidelines_and_HOWTOs/Debugging/How_to_create_useful_crash_reports
***


STEPS TO REPRODUCE
1. Use Nvidia card with 545.29.02
2. Watch any kwin animation or move a window, etc.


OBSERVED RESULT
Stutter/lag

EXPECTED RESULT
Smooth animations

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 5.27.9
(available in About System)
KDE Plasma Version: 5.27.9
KDE Frameworks Version: 6.111.0
Qt Version: 5.15.11

ADDITIONAL INFORMATION
X11

Not my thread, but I don't appear to be the only one encountering this issue.
https://www.reddit.com/r/archlinux/comments/17nrbcg/everything_is_stuttery_after_the_last_upgrade_on/

Comment 1 duncanyoyo1 2023-11-05 16:20:30 UTC

After doing some more digging, it seems to be somehow related to vsync. It seems like the framerate is getting stuck at 1/2 of what it should be. E.g. my 75Hz panel is showing ~38FPS.

Changing the latency option in Settings > Display and Monitor > Compositor does not make a difference.

It seems to be kwin as when I disable compositing, the issue goes away entirely. Same when gaming with the compositor off. No issues. 

Also I have KDE Frameworks Version: 5.111.0. somehow hit 6 by accident.

Comment 2 Zamundaaa 2023-11-06 15:24:44 UTC

This seems to be caused by the NVidia driver update and affects other compositors too, so please report this to NVidia

Comment 3 duncanyoyo1 2023-11-06 15:34:34 UTC

I haven't noticed it with compton or with Mutter, do you see somewhere people are reporting the issue with other compositors? 

The nvidia bug report is all KDE DEs.

Comment 4 Zamundaaa 2023-11-06 15:38:04 UTC

yes, here's someone reporting issues with Sway: https://www.reddit.com/r/archlinux/comments/17nrbcg/comment/k7uo45b/?utm_source=share&utm_medium=web2x&context=3

In general, if things break after a driver update, please report the problem to the driver vendor first. Especially in the case of proprietary drivers there's rarely anything we can do about it.