Before anyone suggests using Envy, no thanks, I would rather I learned how to make it work properly using the system itself and I usually don't like to pollute my system with scripts or packages not from official repositories.
Basically, the problem is the restricted drivers manager shows that the Nvidia driver is installed, but is not in use. The KDE 4 display options do not allow me to choose what driver to use (which it did with KDE 3). I could manually edit the xorg.conf file to change the settings, but like I said, the system should allow this to work without that kind of intervention. I'm sure I'm just missing something basic, so if anyone has a suggestion (other than Envy), I'd appreciate it.
EDIT - Whoops, I just realized this should be in the Multimedia and Video forum. If a mod/admin could move it there, that would be great.