Cannot initialize Compex WLE600VX for 802.11ac?

Valo, Kalle kvalo at
Tue Jun 21 23:47:12 PDT 2016

Tom Marble <tmarble at> writes:

> Setting channel=0 to enable scanning results in finding channel 52
> as the ideal channel, but then (full log in [7])...
> # hostapd -dd /etc/hostapd/wlan0.conf | tee /tmp/wlan0.log
> ... 
>   Mode: IEEE 802.11a  Channel: 52  Frequency: 5260 MHz
>   DFS 0 channels required radar detection
>   Could not set channel for kernel driver
>   Interface initialization failed
> Setting channel=52 and trying again fails with... (full log in [8]).
> # hostapd -dd /etc/hostapd/wlan0.conf | tee /tmp/wlan0-52.log
> ...
>   nl80211: Failed to start radar detection: -16 (Device or resource busy)
> What suggestions do you have to help me identify the cause of 
> this problem (and hopefully resolve it!)?

Do you have CONFIG_ATH10K_DFS_CERTIFIED enabled? Also check that that
regulatory is correct with 'iw reg get' and 'iw phy0 info', especially
that 80 MHz channels are supported.

Also I would try first without DFS on channel 36 just to make it easier
to pinpoint the problem.

Kalle Valo

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