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internal 3g modem

From: Divan Santana
Subject: internal 3g modem
Date: Fri, 27 Sep 2019 12:35:38 +0200

Hi Guix,

Hopefully someone knowledgeable with these things here can help out. :)

I'm trying to get the internal 3g modem to work in my Dell laptop
running guix.

Ideally with networkmanager/modemmanager would be great.

Using nm-connection-editor and selecting mobile broadband, it says
can't find any device.

Creating the connection manually and running it says:

ds@swift ~ $ sudo nmcli con up modem-internal
Error: Connection activation failed: No suitable device found for this 

Creating this file and trying to start the connecting with mbim-network results 
in this:

ds@swift ~ $ cat /etc/mbim-network.conf

ds@swift ~ $ ll /dev/cdc-wdm1
crw------- 1 root root 180, 1 2019-09-27 12:09:35 /dev/cdc-wdm1

ds@swift ~ $ sudo mbim-network /dev/cdc-wdm1 start
Loading profile at /etc/mbim-network.conf...
    APN: internet
    APN auth protocol: unset
    APN user: unset
    APN password: unset
    mbim-proxy: no
Querying subscriber ready status 'mbimcli -d /dev/cdc-wdm1 
--query-subscriber-ready-status --no-close '...
[/dev/cdc-wdm1] Subscriber ready status retrieved: Ready state: 'initialized' 
Subscriber ID: '655071911202447' SIM ICCID: '89270761914025156856' Ready info: 
'none' Telephone numbers: (0) 'unknown' [/dev/cdc-wdm1] Session not closed: 
TRID: '3'
Saving state at /tmp/mbim-network-state-cdc-wdm1... (TRID: 3)
Querying registration state 'mbimcli -d /dev/cdc-wdm1 
--query-registration-state --no-open=3 --no-close '...
[/dev/cdc-wdm1] Registration status: Network error: 'unknown' Register state: 
'home' Register mode: 'automatic' Available data classes: 'umts, hsdpa, hsupa' 
Current cellular class: 'gsm' Provider ID: '65507' Provider name: 'FNB' Roaming 
text: 'unknown' Registration flags: 'packet-service-automatic-attach' 
[/dev/cdc-wdm1] Session not closed: TRID: '4'
Saving state at /tmp/mbim-network-state-cdc-wdm1... (TRID: 4)
Attaching to packet service with 'mbimcli -d /dev/cdc-wdm1 
--attach-packet-service --no-open=4 --no-close '...
Saving state at /tmp/mbim-network-state-cdc-wdm1... (TRID: 5)
Starting network with 'mbimcli -d /dev/cdc-wdm1 --connect=apn='internet' 
--no-open=5 --no-close '...
Network started successfully
Saving state at /tmp/mbim-network-state-cdc-wdm1... (TRID: 7)

ds@swift ~ $ sudo mbimcli -d /dev/cdc-wdm1 --query-ip-configuration 
--no-open=11 --no-close

[/dev/cdc-wdm1] IPv4 configuration available: 'address, gateway, dns, mtu'
     IP [0]: ''
    Gateway: ''
    DNS [0]: ''
    DNS [1]: ''
        MTU: '1500'

[/dev/cdc-wdm1] IPv6 configuration available: 'none'
[/dev/cdc-wdm1] Session not closed:
            TRID: '12'

ds@swift ~ $ sudo ip link set wwan0 up
ds@swift ~ $ sudo dhclient -v wwan0
Internet Systems Consortium DHCP Client 4.4.1
Copyright 2004-2018 Internet Systems Consortium.
All rights reserved.
For info, please visit

Listening on LPF/wwan0/52:da:30:0c:9c:de
Sending on   LPF/wwan0/52:da:30:0c:9c:de
Sending on   Socket/fallback
DHCPDISCOVER on wwan0 to port 67 interval 6
times out.

I think this is the internal modem device:

Bus 002 Device 003: ID 413c:81b6 Dell Computer Corp. DW5811e Snapdragon™ X7 
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               3.00
  bDeviceClass            0
  bDeviceSubClass         0
  bDeviceProtocol         0
  bMaxPacketSize0         9
  idVendor           0x413c Dell Computer Corp.
  idProduct          0x81b6
  bcdDevice            0.06
  iManufacturer           1 Sierra Wireless, Incorporated
  iProduct                2 DW5811e Snapdragon™ X7 LTE
  iSerial                 3 LF81212090021022
  bNumConfigurations      1

It seems from the above it's /almost/ working using mbimcli.

I'm not sure why MM doesn't detect it.

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