Short bio: Computer Scientist, FOSS supporter (read more)
Tux Machines (TM)-specific
NVIDIA's Optimus Technology is currently a notebook technology designed to extend the battery life of the device while still delivering an optimal graphics experience. Optimus works by automatic switching of notebook GPUs: between a low-end low-power IGP and a high-performance GPU. This is dependent upon the needed graphics resources and power source. Switching is done seamlessly and transparently.
While NVIDIA Optimus sounds like something neat and useful for mobile users, it's not supported under Linux. The technology is relatively new, but NVIDIA last year said they had no plans at that time to support it under Linux.