I just bought an external monitor to go with my laptop. The computer is an HP Elitebook 6930p. I'm using Ubuntu 12.04 with the Cinnamon desktop.
The external monitor actually works fine right out of the box. As of now it is acting as an extension of the laptop screen. My problem is that I want to configure Ubuntu to display ONLY on the external monitor, or at least show the launch bar and start menu on the monitor, as I would like to close the computer and still be able to use it. *Unfortunately I can't make ANY changes to the display settings. Even if I don't change anything, the act of hitting the "Apply" button brings this message:
"Failed to apply configuration: %s
GDBus.Error:org.freedesktop.DBus.Error.UnknownMethod: No such interface `org.gnome.SettingsDaemon.XRANDR_2' on object at path /org/gnome/SettingsDaemon/XRANDR"
Obviously I cannot choose to "Mirror Displays". I cannot change ANY display settings. Any solution or workaround would be greatly appreciated.