My external monitor's native resolution didn't show up, so I followed the standard procedure: tried the modelines created from either cvt or gtf, did the xrandr newMode and addmode. The new resolution then does show up in gnome-display-properties. Ok. When I select and apply it, the resolution does changes, but the content of both screen displays (laptop and external) are screwed. I see nicely colored bars and areas, and the mouse cursor is fully operational. The resolution appears to have get changed correctly, as i can see this due the size of the mouse cursor. Furthermore, I can move the cursor and interact with the menus blindly, which continue to work. However, I can't see anything and after a while this is not very productive! :-)
I'm running 11.04, a nvidia card but not using the proprietary driver.
I'd appreciate any any help...