but i found the problem. i installed the correct gaphic-driver but i forgot to change the entry in the xorg.conf
now it runs perfectly
was also the solutionecho "nvidia" >> /etc/modules
nvidia-xconfig
/etc/init.d/gdm stop
gdm
but i have installed the GLX driver.bzflag
Could not set Video Mode: Couldn't find matching GLX visual.
Error creating window - Exiting