I’m getting something very similar to these mouse problems here.
Something is wrong with timing at which KDE/Linux is either pulling or pushing the values to … the device file?
The problem is mainly in the smoothness of the mouse motion. When drawing small/medium circles with the mouse, I almost never see circles in the cursor motion on screen. And quite predictably, if you drag the mouse over KDE UI elements like drop downs that light up or interact, this causes the mouse to slow down.
Strangely, when the mouse cursor travels from being on top of one window to another window, this seems to trigger the delay/slowdown in mouse cursor motion. So scrolling from one side of the screen to another is never smooth and this is unusable.
I think that the system is exhibiting problems of the same nature with the touchpad, but the resulting cursor motion is smooth because of some differences in how touchpad/mouse device files store their values (as to what specific differences in device files IDK…) in other words the touchpad motion feels smooth but the choppiness is still there. The cursor’s resulting motion isn’t affected and thrown off the curve like with the mouse though.
I don’t really know where to start looking. This seemed to be happening on the Sway & KDE live USB’s. It may be a wayland issue. I checked compositing options. I removed blur/transparency from konsole & will do the same as far as I can with KDE but previous experience has taught me that one does not simply turn off KDE transparency…
(My poor GPU… it will be over soon I swear. Do pass gently into that sweet night)