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Nowadays all Optimus laptops are build without a multiplexer (MUX-less), that means the Nvidia GPU has no physical connection whatsoever to the laptop screen. The driver has to cooperate with the driver of the Intel GPU, as the Intel GPU is the only one that can put *anything* on the display.
Bumblebee is actually just starting a second X Server using an OpenGL wrapper library and uses your primary X Server for displaying its stuff. This is very inefficient. The most efficient way of realizing this cooperation is to create a buffer sharing mechanism right on driver/kernel level. However, there are some serious legal barriers as this mechanism is rather invasive - and I don't see this clearing up in the near future, Wayland will probably put everything into chaos first with its requirements for KMS and EGL.
As far as I can tell most AMD based hybrid systems (as well as a few of the first Optimus ones) actually still have a multiplexer. It makes things rather simple and efficient, you just need to support the multiplexer to tell it what GPU to use and AMD actually has some kind of support for it in their proprietary driver (using some dirty script voodoo to switch between OpenGL libs etc when combined with a Intel GPU). The only drawback is that each switch requires a restart of the X Server as it is not (yet?) able to switch GPUs on-the-fly.