[Bug 278524] [ath] Atheros AR9462 `list scan` empty output

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=278524

--- Comment #2 from Adrian Chadd <adrian@freebsd.org> ---
ok, let's see if this is a WB225 NIC (AR9485 + AR30xx BT)

https://techinfodepot.shoutwiki.com/wiki/Atheros_AR5B225


I added btcoex support a while back but didn't enable it by default.

You need to add hint.ath.0.btcoex_profile="wb225" to /boot/loader.conf and
reboot.
It needs to be there before probe/attach so the btcoex code can see it.

Then check dmesg for 'Enabling WB225 BTCOEX'.

the AR9485 has an external antenna switch IC that switches between bluetooth
and wifi, and if it's not all configured correctly you'll end up with no
receive. :-)

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