Originally Posted By: tman
The problem is that without driver support, the extra nVidia GPU is completely useless as the OS won't be able to turn it on. You're forever stuck with the integrated GPU. As you may have guessed, nVidia only support Optimus on their Windows drivers and don't support it at all in any of their other OS drivers. nVidia only give you a massive binary blob as well for the Linux driver so its not particularly great.

Interesting, thats the opposite of how it works on a Mac with dual graphics. With both the older NVidia 9400m/9600m, and the newer Intel/NVidia 330m systems, the discreet GPU is the one that is forced on when booting into Windows or Linux.