I did a fresh install of 43 kde on my girl friends hp amd ryzen5 and when I plugged in a usb it disabled my usb mouse and when I unplugged it it came back!
run a journalctl -f in the terminal, and plug in and unplug the problematic devices.
I can only assume there is some kind of conflict in the identifiers, but without seeing any evidence of what gets produced when one device or the other is plugged in, it’s guesswork.
Feel free to post the output, annotated so that we can see what was inserted and removed alongside the corresponding journal messages.
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