I'm trying to configure dual displays on an Ubuntu 9.10 machine. When I connect the 2 screens (1 VGA input, the other DVI), I see them in a mirrored display. I opened up Display Settings and unchecked the 'mirror screens' box, and when I clicked apply, the machine froze and I had to force restart it. This happened repeatedly for about 6 times until I gave up. How do I set it up to boot up normally with dual display working? thanks.
edit: I thought it might be related to the virtual screen size, so I tried to edit /etc/X11/xorg.conf to add:
SubSection "Display"
Virtual 2560 1024
EndSubSection
But that didn't do much. Each screen works fine on it's own, and together with mirrored display.
