As you might already know Manjaro supports the Optimus technology. We use bumblebee to solve this. VGAswitcheroo support for Nvidia and Ati Hybrid solutions will follow also. However a X restart will be required to switch the GPU. Switching, status determining and setting the power state of the GPUs will be managed by our tool called Bascule.
There are good news about a better Linux support for hybrid graphics! X-Server 1.13 and RandR 1.5 has brought many improvements to switch the GPUs on the fly. The Nvidia driver might soon have native support for the Optimus technology!
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