There is an app for that (https://gfx.io/), but it doesn't switch automatically when battery is in use so you have to enable it manually (and you have to close any apps that are using the discrete chip first).
Mostly though I just use that app to know when the discrete chip is enabled, and then quit whatever program enabled it when I've finished with it.
There is an app for that (https://gfx.io/), but it doesn't switch automatically when battery is in use so you have to enable it manually (and you have to close any apps that are using the discrete chip first).
Mostly though I just use that app to know when the discrete chip is enabled, and then quit whatever program enabled it when I've finished with it.