I use the 4191 driver on a GeForce2go (Acer 634LC). With X there is everything allright, by now ;-). When I start into textmode, I get a nice virtual-console (my boot-vga-mode is 788). After starting X I may temporarily switch back to one of the virtual consoles, or permanently, by terminating X. I all cases the text-mode is flickering as my screenshot shows. Did I do something wrong?
For my XF86config you may look at
(in the posting from 2003-1-20)