I dont have an answer for your question but I think you got further than
We ran into the same problem with the Quadro4 400NVS that Gnome only initialised two screens when we wanted all four.
The first two screens get the Gnome desktop and the other two get the
Xwindows crosshatchweave pattern only. I can move the mouse across
all four screens but it changes to just an "X" as it moves over the
I'd like to get to a situation where I can make a single gnome desktop out
all four screens.
I've attached a copy of my Config file just incase somebody can see something
glaring and wrong.
Appreciate any and all help,