I found out, that the problem dosen't exist when not using the orginal nvidia drivers (downloaded form nvidia). I'll try the build in kernelmodules for nvidia (not nv in xorg) later.
Br Dominik -- [apport] amarokapp crashed with SIGSEGV in pthread_once() https://launchpad.net/bugs/91883 -- kubuntu-bugs mailing list kubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/kubuntu-bugs