I have an HP Pavilion dv6 with an Nvidia GeForce GT 230M running the privative driver version 304.43 and Ubuntu 12.04 LTS x64.
I am able to clone the screen and use "extended desktop". The problem comes out when I try to use another screen (not the laptop's one) and I close its cover. At this time the other screen turns black and when I reopen the laptop's cover again the login screen appears on the external one.
So my question is very simple: Is there a way that allows you to work with an external screen closing your laptop's cover (as its screen has been already disabled via NVIDIA X Server Settings)? It is possible with Windows, so I guess with Ubuntu too :)
P.S. If I maintain the laptop's cover opened it works fine, it's just a matter of space...
Thanks a lot!