I have a clean install of Ubuntu 12.04 on my Lenovo Thinkpad T61. My graphics card is an NVIDIA Corporation G86 (Quadro NVS 140M).
I have installed an additional driver for NVIDIA. When I go to NVIDIA's X server settings interface → X server Display Configuration, I can detect my other monitor (BenQ FP222W) but neither or TwinView or X separate are working fine.
It shows a white background and my mouse pointer with a big "X" shape.
In Ubuntu 11.10 It was working fine.
I clicked "save to X configuration file", logged out, restarted the graphical service (LightDM) . I also restarted the computer, but it did not help.
I even enabled not the recommended version of nvidia driver,no success.
What you fellows think?