> I can now get a decent resolution but X is acting very weird, the system > locks up every now and then for 5-10 seconds (the mouse cursor > dissapears when that happens) and then returns to normal. > > It's obviously not happy. :o) I've had similar problems on a TNT2, GeForce2 MX, and GeForce3 when using nVidia's drivers. When the mouse disappears you can switch to a console (Ctrl-Alt-F2) then back (Alt-F7) and the mouse comes back. This is especially useful if the cursor stops responding comletely.
I think we're just stuck until nVidia writes a good driver or releases the code so the XFree86 guys can fix it.