Can't seem to use 5GHz APs with Intel wireless

[Dhananjay Balan]

On Sun, Jun 03, 2018 at 07:33:30PM +0200, Christoph Moench-Tegeder wrote:

> Is the regdomain/country setting correct for your area and matches your
> AP? Especially in the 5GHz band there are some "gaps" - not all channels
> may be used in all countries (because of possible interference with
> radar equipment and other stuff). See:
> https://en.wikipedia.org/wiki/List_of_WLAN_channels#5_GHz_(802.11a/h/j/n/ac/ax)
> 

Thanks for taking time to explain. 

Turns out PEBKAC. I had this offending line burried in rc.conf

create_args_wlan0="country DE regdomain FCC4"

According to regdomain(5) <!-- FCC4 is 2.4GHz FCC w/ Public Safety Band (PSB) -->

So I was forcing my card to do 2.4Ghz it seems, removed it - everything worked like charm. I can see and connect to 5GHz 11a aps.

wlan0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
	ether xxxx
	inet 192.168.1.13 netmask 0xffffff00 broadcast 192.168.1.255 
	nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
	media: IEEE 802.11 Wireless Ethernet MCS mode 11na
	status: associated
	ssid xxxx channel 36 (5180 MHz 11a ht/40+) bssid xxxxxxxx
	regdomain FCC country US authmode WPA2/802.11i privacy ON
	deftxkey UNDEF TKIP 2:128-bit txpower 17 bmiss 10 mcastrate 6
	mgmtrate 6 scanvalid 60 ampdulimit 64k ampdudensity 4 -amsdutx amsdurx
	shortgi -stbc -ldpc wme roaming MANUAL


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dbalan