Sierra Wireless EM7455

[Aleksander Morgado]

On Wed, Apr 13, 2016 at 8:48 PM, Stefan Armbruster
<stefan at armbruster-it.de> wrote:
> 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.
>
> If attached debugging outputs from modemmanager and networkmanager and
> mmcli -m 0. I've removed IMEI numbers.
>
> Any hints to get this card working? Please let me know if additional
> information is required.


It may be the FCC auth issue, yes.

We do not handle that yet in ModemManager for MBIM devices; although
we already have some working setup to handle it in libqmi/libmbim
(branch "qmi-over-mbim" in each of them). If you're able to get those
branches compiled, you can try to send the FCC auth QMI command over
MBIM, as explained here:

https://lists.freedesktop.org/archives/libmbim-devel/2016-April/000708.html

-- 
Aleksander
https://aleksander.es