The framebuffer / riva drivers in the kernel are not the same as the closed-source drivers from nvidia.com. The nvidia.com drivers need to be reinstalled every time you change your kernel.
An easy way to check if you're using the closed-source drivers is to look at your XF86Config / Xorg.conf. If the graphics device has a line that says Driver "nvidia", these are the nvidia.com closed source drivers. Driver "nv" is the open source counterpart.
Last edited by kpex; 12-01-2004 at 12:04 PM.