Sierra Wireless EM7455

Dan Williams dcbw at
Thu Jul 28 15:10:10 UTC 2016

On Thu, 2016-07-28 at 00:15 +0200, Aleksander Morgado wrote:
> On Wed, Jul 27, 2016 at 10:29 PM, Nicolas Christener <lists at>
> wrote:
> > 
> > I saw some other mails regarding the same topic but was not able to
> > find a
> > solution for my problem. I got a Thinkpad T460s and run into
> > problems with the
> > built in Sierra Wireless EM7455.
> > 
> > I built libmbim and libqmi from master and rebuild ModemManger
> > (1.6.0) which
> > seems to pick the two libs but unfortunately I can't connect to the
> > network.
> > 
> > When trying to connect (I use the Gnome 3 menu) I get the following
> > messages
> > (running modemmanager with --debug):
> > 3y
> > 
> > Any idea what I miss?
> > 
> > Thank you very much for any hint/help!
> Looks like the modem is getting unregistered from the network as soon
> as you try to get connected? Not sure why that could be. Anyone?

That's what it looks like to me too.  I wonder what the firmware
version is?  The only problems I usually have on connect the modem
crashing entirely, not just disconnecting.  Only other lame guess I
have is an antenna problem.

But given that it's a Sierra, I wonder if Nicolas could run the
following on the modem's AT port:

<reproduce the problem>

That might tell us if it's a modem problem or a network problem.


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