I used Lucid with gnome2 on this Laptop (Dell Vostro 1500, Nvidia 8600GT M, external Monitor via VGA with 1920x1080) and installed Oneiric because of using an SSD now.
I used to have 2 separate X Sessions because I want the Desktop not to change on my external Monitor when I switch Desktops on my Laptop Display.
Now on 11.10, I can set up everything with nvidia-settings (using nvidia-current but tried -updates and the 173 one too) but it won't work on the external Monitor. It either shows a white Screen or (i think when I click into it) it shows the Wallpaper. The mouse remains as "x" like in low graphics mode.
I tried the xorg.conf from the 10.04 but that didn't work either.
Is this a known Problem/Bug? Or is this not supposed to work in Unity (problems with two Dashes maybe)?