My GeForce4 MX 420 didn’t work properly with OpenGL under a fresh install of Dapper Drake. Fixing it, however, proved to be really easy:
1) Install the nvidia package:
$ apt-get install nvidia
2) Edit /etc/X11/xorg.conf and replace the ‘driver’ where it says ‘nv’ with “nvidia”:
Section “Device”
Identifier “NVIDIA Corporation NV17 [GeForce4 MX 420]”
#Driver “nv”
Driver “nvidia”
BusID “PCI:1:0:0”
EndSection
3) Kill X with control-alt-backspace
4) Login again and test if it works by running glxgears and glxinfo on the console
DavidCraddock.net 