Well, after having removed completely linux-generic linux-restricted- modules nvidia-glx and nvidia-kernel-common, and reinstalled them, the problem _seems_ gone.
Checked for diff in the log file: 14c14 < (==) Log file: "/var/log/Xorg.0.log", Time: Mon Feb 26 20:59:08 2007 --- > (==) Log file: "/var/log/Xorg.0.log", Time: Sun Feb 25 13:58:07 2007 581,582c581,584 < SetGrabKeysState - disabled < SetGrabKeysState - enabled --- > (II) NVIDIA(0): Setting mode "640x480" > (II) NVIDIA(0): Setting mode "1280x1024" > (II) 3rd Button detected: disabling emulate3Button > -- Choppy xorg after upgrade to xorg 7.2 https://launchpad.net/bugs/87786 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs