My Raspi 4 has a custom metal case, which means the on-board Wifi chip has a hard time getting a reliable signal to my router downstairs. Therefore I want to use an external USB-Wifi adapter and then disable the internal one.
Currently I have three working connections to my router, Eth0, Wlan0 and Wlan1.
Soon I will unplug Eth0 (as I'm only using a cable while I'm setting everything up). which will leave me with the two Wifi connections.
My question is, how can I turn off the built-in Wifi device, without disabling the external Wifi dongle?
The external dongle uses RTL8812AU drivers (github.com/gordboy/rtl8812au.git).
The reasons I want to do this are to keep power consumption down, and also avoid multiple connections to the router because it keeps network routing simpler.