I have two monitors the left/primary is aligned horizontally but the right/secondary is aligned vertically. When I first installed, I set this up without problem using the display settings. But when I installed the nvidia driver, I can no longer rotate the second monitor. I looked into the nvidia x server settings but I don't see any option to rotate the display and when I look at the display settings, it only sees one large "Unknown" monitor.
OS: Linux-X86_64 (Ubuntu 11.10)
GPU: Nvidia NVS 290
Nvidia drivers: version: current