Comment 2 for bug 994835

I am having the same problem. I've been using 11.04 until now, since it supported my three monitor setup (with 2 nvidia cards).

Hopeful that multi monitor configurations had been fixed in 12.04 I took the chance and upgraded. Unfortunately, the only way I can get the three monitors to work simultaneously is using the nvidia proprietary driver and xinerama. (With 11.04 it worked with separate X screens, but that failes in 11.10 and 12.04).

With Xinerama, the theme is not applied to all the windows - like in the image linked in the bug description - and of course compiz is out of the question but that's another story...

My xorg.conf is attached in case that helps...