Thanks for pointing out the "Secure Keyboard" option. Make sure to test it before relying on it, though. I just tested in my system and it does not prevent "xin

Thanks for pointing out the "Secure Keyboard" option. Make sure to test it before relying on it, though. I just tested in my system and it does not prevent "xinput test" from receiving the key presses, even when typing the "su" password.