Bug 246031

Summary:	Using regulatory domain FCC4 disables 5Ghz networking
Product:	Base System	Reporter:	Tom Sparks <tsparks>
Component:	wireless	Assignee:	freebsd-wireless (Nobody) <wireless>
Status:	New ---
Severity:	Affects Only Me	CC:	emaste
Priority:	---
Version:	12.1-RELEASE
Hardware:	amd64
OS:	Any

Description Tom Sparks 2020-04-29 18:17:12 UTC

I was setting up a laptop with FreeBSD 12.1-RELEASE and the installer set the regulatory domain to FCC4, I noticed it didn't show any 5Ghz networks.

I switched it to FCC3, and suddenly there were 5Ghz networks.
I thought it might be a driver bug specific to iwn but it turns out that it happens on my RPI3 with a ral USB nic.

I mentioned this to a friend who's very familiar with WiFi stuff on FreeBSD and he mentioned that this sounded like a channel list issue.

I also realized finding info/documentation about the regulatory domain stuff on FreeBSD was hard, so I just started digging into the source tree.

I read through src/lib/lib80211/regdomain.xml and I noticed the stanza for FCC4 had no entry for <netband mode="11na"> wheras FCC3 had an entry.