By default the Cinnamon/Gnome/Mate desktop environment loads its own display
configuration from the file ~/.config/monitors.xml instead of using the
settings defined in /etc/X11/xorg.conf. This can be a little bit annoying if
you are using the nvidia-settings program to configure your displays (which
will use xorg.conf), since anything entered there will be overridden by
monitors.xml every reboot.
By doing the following changes we will disable the "Display Manager" in