e0qdk, 3 months ago

I don’t know about KDE in particular, but I’ve had problems with USB mice waking various Ubuntu systems when they’re not directly connected (i.e. there’s a hub or KVM in between it and the computer). The workaround I used for that was to remove the mouse input (e.g. by carefully pressing a physical button on the KVM) – which was good enough for me – but I think there is a programmatic way to block particular classes of input from waking the system if some device is waking your system inappropriately.

Doing a quick search turned up this: askubuntu.com/…/how-do-i-prevent-mouse-movement-f… – I can’t vouch for any of the specific techniques there though.

Worth noting that while I had a problem with the mouse specifically, other hardware could be causing your system to wake up.