I've been trying, quite unsuccessfully, to set up "twin view" on 11.04 with a Matrox G400/G450.
At this point I can't recall what I may have tried.
Currently each monitor is displaying the same video and pressing "Detect Monitors" within System -> Preferences -> Monitors does nothing.
I have scoured the interwebs for instructions, tried several of them to no avail.
Most recently I read through several threads on the Ubuntu forums and it seems many others have the same problem with no resolution.
Thank you for your time!