Hybrid Graphics on Desktop PC's

It would seem a logical idea, and I think such functionality exists in some Laptops, but why haven't manufacturers looked into Hybrid Graphics systems.

Specifically the use of integrated GPU for basic tasks, and only bringing online discrete graphics when needed (or forced by the user), for example when playing a game, or doing something graphically intensive.

It would see a good way to reduce power consumption, I realise it would require combining GPU's through a single output feed, but as many motherboards these days include various video out onboard, it should just be a case of routing the video out from a discrete GPU through the motherboard.
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  1. Actually, GPUs use very little power when they are idling, around 15 watts. And there is such technology that you seem to describe as well, it's called Lucid Virtu.
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