"port not candidate" error message with DELL Wireless 5570 (aka Sierra Wireless AirPrime 7W5P6)

[Giuseppe Sacco]

Il giorno mer, 17/06/2020 alle 17.58 +0200, Giacinto Cifelli ha
scritto:
> Hey,
> 
> On Wed, Jun 17, 2020 at 2:19 PM Aleksander Morgado
> <aleksander at aleksander.es> wrote:
> > [...]
> > Oh wow, this is strange. And even more strange, I just found out a
> > very similar problem in my own host system running Arch, this time
> > with a net port instead of a cdc-wdm port:
> > 
> > ModemManager[461452]: <debug> [1592395909.393490] [base-manager]
> > adding port wwan0 at sysfs path:
> > /sys/devices/pci0000:00/0000:00:14.0/usb1/1-8/1-8.2/1-
> > 8.2:1.10/net/wwan0
> > ModemManager[461452]: <debug> [1592395909.394961] [base-manager]
> > port
> > wwan0 not candidate
> > 
> 
> could there be some bad udev file breaking the chain of rules?
> check
>    journalctl --boot |grep '\ udev\:'

No, this is not matching any line.

Bye,
Giuseppe