I have the same problem with my Inspiron 2650, Geforce2 Go 16mb under Mandrake and SUSE 9.2.
AlxMAX: I assume that the dell drivers you found did not solve the problem?
Also, I looked at your TwinView workaround. Is this a viable solution, or do I actually need to have an external monitor plugged in all the time to use this solution? Sorry I didn't quite understand that from your document about.
Regards and I hope you figure it out! You have more chance than me I think, being the newbie that I am!