ModemManager warning messages

[Aleksander Morgado]

Hey,

>
> I am using a  ModemManager - 1.6.4 ( Ubuntu 16.06.4)  running on a Sierra Wireless EM74xx modem
>

That Ubuntu version seems wrong, I assume you mean 16.04?

> I happen to run the following command multiple times ( modem resets as part of test functionality).
>
> mmcli -m 1 --reset
>
> The LTE interface came up fine and got connected after the reset but seeing the warning messages from ModemManager every 30 secs.
>
> ModemManager[1462]: <debug> loading extended signal information...
> ModemManager[1462]: <warn>  Couldn't load extended signal information: Couldn't peek QMI port
>
> how can this be resolved? Is restarting the ModemManager the only option ?
>

This looks like some stale modem reference left around, which prevents
the extended signal info loading context from being disposed and
cancelled.
I recall some fix about that, but a very very long time ago.

Your best chance is to use a newer MM version, 1.6.4 is extremely old
and not even the last 1.6.x stable release. Maybe try with my Ubuntu
16.04 PPA here?
https://launchpad.net/~aleksander-m/+archive/ubuntu/modemmanager-xenial

-- 
Aleksander
https://aleksander.es