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Are you familiar with Bumblebee? It provides switching between integrated and discreet graphics without reboot for NVIDIA Optimus-equipped laptops.

Although at the moment it's a manual install, it should find its way into popular distros soon enough.

http://bumblebee-project.org/

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Bumblebee works well for me on a Samsung QX411. Once installed, just prepend 'optirun' to any command (like when running a game) and it will use the discrete graphics card.

It's good to hear Bumblebee works now. When I was researching laptops earlier this year I read that it was unstable.

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