(I don't know if this is the correct package but i assume its this one if im wrong... Sorry)
But i'm on the utopic dev dist and when i upgraded my xubuntu setup, monitors don't save there correct settings. EG:When i log in, my main window does not start up it shows that it exists but doesn't automatically load in-till i go into xfce4-display-settings and re-enable it.
This is fixed now with the introduction of display profiles.
Also, the correct product would have been xfce4-settings.