Sierra Wireless EM7455

[Stefan Armbruster]

Hi,

my new Thinkpad X1 Yoga is equipped with a Sierra Wireless EM7455 LTE
card, which does not work right now. I have installed Ubuntu 16.04
with a 4.6-RC2 mainline kernel.

The card is detected by modemmanager, but not accessible in network
manager. Its state in mmcli is always "disabled".

My suspicion is that it's related to the "FCC authentication"
discussed here some months ago.

Some details:
> uname -a
Linux x1 4.6.0-040600rc2-generic #201604031130 SMP Sun Apr 3 15:32:46
UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

> dpkg -l modemmanager libqmi-glib1 libmbim-glib4
+++-===================-===============-============-================================================================
ii  libmbim-glib4:amd64 1.12.2-2ubuntu1 amd64        Support library
to use the MBIM protocol
ii  libqmi-glib1:amd64  1.12.6-1        amd64        Support library
to use the Qualcomm MSM Interface (QMI) protocol
ii  modemmanager        1.4.12-1ubuntu1 amd64        D-Bus service for
managing modems

> lsusb |grep Sierra
Bus 001 Device 036: ID 1199:9079 Sierra Wireless, Inc.

The debugging output of modemmanager is availabe at
http://pastebin.com/bfb63zAC, for networkmanager at
http://pastebin.com/FL5QVuKr and the output of mmcli -m 0 at
http://pastebin.com/9WS7aB5T. Due to attachment size restriction for
this list I couldn't send them directly - please apologize. I've
removed IMEI numbers.

Any hints to get this card working? Please let me know if additional
information is required.

Cheers,
Stefan