I have a 13" Macbook from the same year and it pretty much just works with Nixos. There was a bit of trouble getting Bluetooth working, but as I'm not using it

I have a 13" Macbook from the same year and it pretty much just works with Nixos. There was a bit of trouble getting Bluetooth working, but as I'm not using it much can't say for it's instability. What is graphics switching, there is one (integrated) GPU, no?