Good point ... installing the nvidia-glx (1.0.9631) resolved the problem. However I have now another problem when resuming from suspend/hibernate mode > black screen and freeze.
I will first gather more information about this behavior on the internet... -- Switch tty, shutdown, reboot cause colorful screen with Nvidia proprietary driver https://launchpad.net/bugs/85451 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
