Comment 2 for bug 1951586

I am not sure if netplan (i.e. the network definition of a specific WiFi interface) is the correct place to handle this. The regulatory domain is a global concept that is being handled in the kernel and affects all radio devices, like WiFi and Bluetooth. If we change that on a single wifi interface definition, it will have side-effects on other radios.

crda is being used for that global setting and it can be configured in /etc/default/crda, e.g.:

$ cat /etc/default/crda
REGDOMAIN=GB

Then there are drivers (like iwlwifi), that do it on their own way or do "Location Aware Regulatory" (LAR) and ignore any hints the kernel might pass to them.

What's the output of `iw reg get` on the Raspberry Pi?

Having a configuration setting in netplan, we could certainly instruct wpa_supplicant to pass a `country=GB` hint to the kernel (similar to using `iw reg set GB` manually`), but that would not work for all drivers and would have side-effects on other radios. Also, this could only be implemented for the networkd/wpa_supplicant backend renderer, as NetworkManager does not support setting a regulatory domain manually AFAICT.

https://wireless.wiki.kernel.org/en/developers/Regulatory