The newer laptops with these GPU combos are different (as of GT/GTX 500M series) and no longer work as one with regards to Drivers.
NVIDIA Optimus Technology is something older "Intel HD + NVIDIA GPU" laptops had where these two GPUs acted like one but auto-switched based on needs/loads.
The NVidia processor was used to render games, and was listed in dxdiag under the Render tab. After installing the Intel card, the Microsoft Render device disappeared from both dxdiag and Device Manager, replaced in both cases by the Intel Card. In my case, the problem was resolved after installing Intel HD Graphics 4600, and then the NVidia driver. Optimus only works if you have the necessary drivers for both cards installed. Newer laptops use Nvidia's Optimus Technology to switch between the high performance Nvidia processor and the slower but more power efficient Intel integrated graphics. Terribly sorry to resurrect this thread, but I recently ran into this problem and seem to have found a solution, for anyone else having this issue.
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