d to start with “Monitor-” followed by the device identifier. The device identifier you can find using xrandr. If I run xrand... see here, I have 2 lines starting with a monitor identifier (mine are “DVI-0″ and “DVI-1″). You will also see the same identifiers several places in your xorg.log file. Yo... ues to your display setup. Also check what actual identifiers you get for your monitors. My setup is w