[kwin] [Bug 476712] Compositing sometimes locks to 30 FPS instead of 60, with no clear pattern

[Tinolm]

https://bugs.kde.org/show_bug.cgi?id=476712

--- Comment #4 from Tinolm  ---
(In reply to Nate Graham from comment #3)
> Thanks for the info.


Please (if possible) let me know if I can give more info or logs etc.

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[kwin] [Bug 476712] New: Compositing sometimes locks to 30 FPS instead of 60, with no clear pattern

[Tinolm]

https://bugs.kde.org/show_bug.cgi?id=476712

Bug ID: 476712
   Summary: Compositing sometimes locks to 30 FPS instead of 60,
with no clear pattern
Classification: Plasma
   Product: kwin
   Version: 5.27.9
  Platform: Archlinux
OS: Linux
Status: REPORTED
  Severity: normal
  Priority: NOR
 Component: compositing
  Assignee: kwin-bugs-n...@kde.org
  Reporter: omg-ichfind-keinen-na...@protonmail.com
  Target Milestone: ---

SUMMARY
***
(I am not entirely sure what exactly if kwin is causing it but, ) 
As long as my compositor is running, I get strange behavior.
My frame-rate sometimes seems to get locked at 30/31FPS, with no clear
indication why.
It does not happen by itself, sometimes maximizing or minimizing a windows
fixes it, until the next window change.
But not always, so the cause seems very hard to figure out. While my cursor
doesn't seem to be affected by it, all my applications are, Browser,
Media-Player, (non-full-screen) Games etc. 
Moreover my Applications cannot notice the difference, they claim to run at
60FPS but using the "Show FPS" effect from the settings, I was able to make
sure my frame-rate is actually jumping between 30 and 60FPS.
My browser (Brave flatpak) seems to affect it even more, right now, while
typing I see my frame-rate jumping between 30 and 60. I have tried many
different settings, disabling effects, trying all smoothness/responsiveness
settings for the compositor.
***


STEPS TO REPRODUCE
1. Login
2. Doing any kind of window Transformation
3. Notice FPS change

OBSERVED RESULT
Seemingly random 30FPS lock

EXPECTED RESULT
Smooth 60FPS with Vsync. (Like it used to be)


SOFTWARE/OS VERSIONS
Linux/KDE Plasma:  Arch linux, 
Kernel: 6.5.9-arch2-1 (64-bit)
KDE Plasma Version: 5.27.9
KDE Frameworks Version: 5.111.0
Qt Version: 5.15.11
Using X11


ADDITIONAL INFORMATION
GPU is : GTX 1650 SUPER 
CPU: AMD RYZEN 5 3600
I am having this issue with 2 monitors right now, 
however I started using the second one not long after the the problem first
occurd.
Having this issue since my last system update, so nvidia driver might be
related/cause.

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[kwin] [Bug 476712] On X11, compositing sometimes locks to 30 FPS instead of 60, with no clear pattern

[Tinolm]

https://bugs.kde.org/show_bug.cgi?id=476712

--- Comment #2 from Tinolm  ---
A little context:
I have a laptop (AMD GPU/CPU) and a Desktop PC (AMD+NVIDIA), I use wayland
pretty-much only on my laptop, 
however I use only x11 on my main PC. I tried wayland on it a long time ago, it
didn't even seem to start, black screen, sddm didn't seem to "handover". 

I have just tried plasma in wayland, and it's much worse, looking at the FPS,
when not moving anything, it goes up to 200-300.
As soon as a start moving my cursor it seems, heavy drops, to 25FPS, 
with the difference to x11 beeing: 
1: FPS is 5 frames lower when moving mouse
2: Cursor and whole system is a little unresponsive, with sluggish/laggy
cursor. 
3: framrate never seems to stay at 60
Changing compositor settings does not change anything, while x11 still somewhat
works, wayland session is pretty much unusable for me right now.

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