Ok. This is an openSUSE 11.3 specific issue. The default kernel (version 2.6.34) caused all problems and I was able to fix my problems by upgrading to 2.6.36 . Sorry for the trouble and that I thought that the nvidia-driver is the root of all problems.
 Kernel-Repository: http://download.opensuse.org/reposit.../openSUSE_11.3
 Bugzilla: https://bugzilla.novell.com/show_bug.cgi?id=625339