ModemManager Issue with multiple WWAN Sierrawireless Ubuntu 22.04

Ankur Jain ankurjain230981 at
Sat Mar 9 08:42:52 UTC 2024

Thanks, Aleksander for your reply, I will check with them.


On Fri, Mar 8, 2024 at 3:06 PM Aleksander Morgado <aleksandermj at>

> Hey Ankur,
> >
> > I want to report an issue with the modem manager in Ubuntu 22.04. Even
> though the modem firmware is updated, the modem manager service causes
> frequent disconnection issues. However, when I disable the modem manager
> service and use qmicli and minicoM methods, the modem works fine without
> any disconnections. I tried contacting the modem using Sierra MC7304 &
> MC7430, but it did not solve the problem. The modem manager provides all
> the necessary details, but it keeps resetting frequently when I use the
> internet or live streaming applications.
> >  I would appreciate your support in resolving this issue.
> >  Please let me know if you require any additional information or logs.
> >
> I'm afraid there is not much we can do, if the issue is the modem
> crashing. You said that using qmicli or AT commands makes it more
> stable, so it could really be related to some of the setup MM does,
> but even in that case, only the manufacturer will be able to analyze
> the modem crashes. The best path forward you have would be to contact
> Sierra support so that they guide you in how to retrieve modem traces
> they can analyze :/
> The MC7304 is one of the modems that I test on every MM release, and I
> haven't noticed any strange myself, but of course my network
> conditions are not the same as yours.
> --
> Aleksander
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