Weird mouse anomalies after update to KDE Plasma 6.1

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I updated to kde plasman 6.1 this morning, and I typically use wayland. I rebooted my computer, and now i’m constantly getting intermittent mouse lag issues. The mouse actually froze during one of my games I was playing. Also the mouse will grow to like 300x the size of the normal pointer, and then shrink back down. Really weird things going on. Any help would be greatly appreciated.

I’m using cachyos kernel 6.9.5-2 cachyos inside of arch linux, but had no problems before the upgrade.

Things i’ve tried:

Verifying that mouse acceleration was one, I’ve tried off and on and makes no difference.

Verified that the logitech mouse is set as the mouse device, although for some reason my keyboard was set as the default mouse device.

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You can disable the shake cursor (mouse gets bigger) in the system stetting → accessibility → shake cursor

What graphics card are you using, intel, nvidia, amd?

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I’m using the NVIDIA Corporation AD104 [GeForce RTX 4070]

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Forgot to ask: Are you using wayland? If so, can you check if you have the same stutters in the X11 session?

Thats an issue with (gaming) keyboards declaring themselves as pointers :frowning:

I have 1 mouse plugged in and 4 show in the setting :smiley:

Unfortunatly this is a difficult problem to fix.
Upstream (libinput) suggests this is not solvable without a hand-maintaned database.

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to make things even more complicated, i’m using a kvm switch as well. So that could be an issue as well with wayland. I’ll probably test it not connected to the KVM and see if that makes a difference. Is there a way to force it to not lag or troubleshoot it to see what’s causing the mouse lag?

I haven’t tried yet on X11 to see if it’s a wayland issue or not.

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As for your lags, you likely hit a driver bug.
See [MAJOR] KDE Plasma Desktop Frameskip/Lag issues on driver 555 - Linux - NVIDIA Developer Forums

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That might be true if i was using driver 555, but i’m using driver 550, and had zero issues before I upgraded.

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So it appears when i switch to X11, all my issues go away. Would adding NVreg_EnableGpuFirmware=0 to my /boot/loader/entries make a difference? it appears he added the command under /etc/kernel/cmdline, but i don’t see that file on my system.

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Is it possible that you have Adaptive Sync enabled? For me on TU106 (RTX 2070) with driver 550, disabling it solved the laggy cursor problem.

I haven’t tried X11, though. As for where the kernel parameter (nvidia.NVreg etc) should be added, that depends on the distro and bootloader you’re using. I’m using rEFInd, but you’re probably using GRUB, and I don’t know enough about how CachyOS manages it.