[Sholmesy]

I did not know this, that is interesting.

As in, the OS driver for the USB controller? Feels like a lot.

[megous]

Google USB-PD. Devices on either end of the USB cable could be dumb, and it would revert to some base minimum requirements (5V 500/900mA or so). But notebook may not be able to negotiate for higher power or higher voltage for charging.