Re: iwlwifi problems after forcing iwlwifi to use 5G SSID

On Mon, 7 Jul 2025, Kevin Oberman wrote:

> Late last month I removed my 2.4G SSID from wpa_supplicant.conf which
> finally got my Intel Alder Lake card to associate with my 5G SSID and set
> the mode to 11ac. This worked fine until I re-booted. Now the network
> failed to start, spitting out repeated 'No beacon heard' messages with the
> interface rapidly moving DOWN and then UP, finally giving up and leaving
> the Interface DOWN.
>
> After logging in, I did 'service netif start wlan0' and the network came up
> fine and continued to be stable until I next rebooted the system when the
> same thing happened again.
>
> The log of the event is attached. Much is repetitive, but kept changing a
> bit until the network was restarted.

I am seeing this at times in my development bhyve but I wasn't able to
pinpoint it to anything specific yet.

service wpa_supplicant restart wlan0

should be enough to get you out of this;  usually no need to throw away
the entire wireless interface and re-create it.  I would say in 19 of 20
times this happens that's doing the job for me;  there are times when I
have to do it twice.

Out of curiosity, was it warm restarts or cold boots from power off?

-- 
Bjoern A. Zeeb                                                     r15:7