Some weeks ago I was giving a presentation with my Mac and had my Ubuntu laptop to show some demos on it. When I switched the connector of the beamer from my Mac to the Ubuntu machine I had to notice with astonishment that the beamer wouldn't show a damn image. So I had to make the demos with everybody standing in my back and trying to see what's going on.
After the presentation I played around with the beamer and different OSes and the beamer was always working fine exept with Ubuntu.
After having checked the configs and read a little bit about it I found out what to do to make it work.
Just add this little line to your xorg.conf (etc/X11/) file:
sudo vi /etc/X11/xorg.conf
scroll down to the "Device" Section and add
Option "Clone" "true"
save the config file
restart your X server and there you go the screen of the beammer will enlighten.
