Comment by paines

Dirty hack, like bumblebee? Well since driver 440.44 this kind of thing is incooperated into the nvidia driver itself. You can use it on demand. It idles at around 1w and is used for some physics and other decoding capabilities if i recall correctly. If you want to run a game or an app using nvidia you prepend it with an environment variable, otherwise intel gfx is used. It's not dirty, and works quite well imho... To make it more convenient:there are even extensions for gnome to say use nvidia with this and that app... Sure, to have the nvidia card kick in triggered by the OS somehow when really needed would be the non-plus ultra, but come on, this is science fiction :D