It is incredibly annoying to me that my mouse wakes the computer when I barely touch it. If I want my PC to turn on, I press the Super key.
I find very hacky scripts online, I tried some but they didn’t work. How did you disable it?
This option is missing from settings.
On mine it was playing with some /sys/bus/usb/devices/1-4/power/wakeup or something, (use the right device number from lsusb), also there is some settings in the BIOS to power or not USB when sleeping, obviously if some USB port have no power, wakeup cannot work :) Every setup/BIOS is kinda different though.
And I have had the same problem as OP with just knocking the desk and the computer wakes up and it is annoying!
My latest trackball I switched it to Bluetooth mode so when PC is sleeping, no BT at all.