Re: unable to bringup wifi AP "No suitable device found for this connection"

[Patrick Mansfield <patmans yahoo com>]

On Sat, Jun 27, 2020 at 10:55:45PM +0200, Thomas Haller wrote:
> On Sat, 2020-06-27 at 13:38 -0700, Patrick Mansfield via
> networkmanager-list wrote:
> > Hi -
> >
> > I had my wifi working as an AP at one point, but had to alter things
> > to get my wired
> > network working (had a bad PCI dual port card and replaced it).
> >
> > Running up to date Fedora 31, kernel 5.6.19-200.fc31.x86_64.
> >
> > # nmcli -v
> > nmcli tool, version 1.20.12-1.fc31
> >
> > I completely removed and added back the interface using nmcli.
> >
> > Now when I try to bring it up, I get:
> >
> > # nmcli con up nm_wifi0
> > Error: Connection activation failed: No suitable device found for
> > this connection (device lan0 not available because profile is not
> > compatible with device (mismatching interface name)).
>
> Hi,
>
>
> NetworkManager didn't find *any* device that was suitable to activate
> the profile. It somewhat arbitrarily said that for example "device lan0
> was not suitable due to reasons"). It should be smarter to recogonize
> that device wlan0 would be the better one to report in the error
> message.
>
> You'd get a better message if you do:
>
>   nmcli con up my_wifi0 ifname wlan0
>
> to tell NetworkManager to activate the profile on that device. But that
> still wouldn't succeed, it would just give a more suitable error
> message.
>
>
> What does `nmcli device` say?
>
> If the device TYPE is not "wifi", you didn't install the Wi-Fi plugin
> (install it and restart NetworkManager).
>
> If the device of type wifi but in state "unavailable", probably
> something is wrong with wpa_supplicant. Check the logs. Consider
> enabling level=TRACE logging (and restart NetworkManager to get the
> relevant messages picture). See 
> https://cgit.freedesktop.org/NetworkManager/NetworkManager/tree/contrib/fedora/rpm/NetworkManager.conf#n28
>  for hints about logging.

Thanks - I had an issue with wpa_supplicant, and I had left old network names in I
think to avoid the messages below. I have it runing now and the AP is working! (Also
had to give it an IP address.)

I'm getting these logged about every second:

Jun 27 14:24:51 umbrella wpa_supplicant[79758]: wifi0: CTRL-EVENT-SCAN-FAILED ret=-95 retry=1
Jun 27 14:24:52 umbrella wpa_supplicant[79758]: wifi0: CTRL-EVENT-SCAN-FAILED ret=-95 retry=1

Any idea on how to stop the above?

-- Patrick