NVidia GeForce FX Go5200
Linux X.Org driver
Default X.Org NVidia driver, called "nv" works.
Display on the internal LCD works as long as you set the monitor settings correct in order to achieve the proper resolution.
External VGA port
Proprietary NVidia driver
Nvidia hadrware accelerated driver installation is basically the same on every Linux with NVidia card. Here you can find a gentoo guide: 
First, you need a kernel module. On Debian, you can install it using module-assistant, type
m-a a-i nvidia
Make sure you have the module loaded, when you run X.
Second, get the latest X driver from NVidia. The page is . It will install the driver. Then, you have just to tweak X config to use module "nvidia" in place you've used module "nv".
Linux kernel Framebuffer driver
Works, but could cause conflicts with propertiary drivers in some situations.