I’ve got a Dell N411Z laptop. Nothing flashy, and it got dropped on one corner so when I adjust the tilt of the screen, the broken hinge triggers a button, which randomly sends a signal for the letter ‘x’ to whatever app is active at the time. Here are my notes to get it to quit doing that. install ‘xbindkeys’ (available in main repositories for both Ubuntu and Fedora). You have to find out what the ‘signal’ looks like to xbindkeys, do so by running xbindkeys -k It tells you then to push a key.