Sierra Wireless EM7305 SIM state detected falsely

[Patrick Brueckner]

Im on Ubuntu 15.10 with kernel 4.2.0-34-generic on 64bit. My Laptop has a Sierra Wireless EM7305 WWAN modem built in, which used to work, when I first received the laptop (on Ubuntu 14.10).

ModemManager 1.4.12-1ubuntu1
NetworkManager 1.0.4-0ubuntu5.3

The modem does not show up in NetworkManager anymore. ModemManager reports the SIM to be missing, but it isn't. I booted up a Windows VM and attached the USB device to confirm the modem correctly detects the SIM.

mmcli -m 0 | grep -Ev equipment\|imei

/org/freedesktop/ModemManager1/Modem/0 (device id '70f86bd11e9d52c0a616806d8577df83343c0cd3')
  -------------------------
  Hardware | manufacturer: 'Sierra'
           | model: 'MBIM [1199:9063]'
           | revision: 'SWI9X15C_05.05.47.00'
           | supported: 'gsm-umts, lte'
           | current: 'gsm-umts, lte'
  -------------------------
  System | device: '/sys/devices/pci0000:00/0000:00:14.0/usb1/1-4'
           | drivers: 'cdc_mbim'
           | plugin: 'Sierra'
           | primary port: 'cdc-wdm0'
           | ports: 'cdc-wdm0 (mbim), wwan0 (net)'
  -------------------------
  Numbers | own : 'unknown'
  -------------------------
  Status | lock: 'unknown'
           | unlock retries: 'unknown'
           | state: 'failed'
           | failed reason: 'sim-missing'
           | power state: 'low'
           | access tech: 'unknown'
           | signal quality: '0' (cached)
  -------------------------
  Modes | supported: 'allowed: 2g, 3g, 4g; preferred: none'
           | current: 'allowed: any; preferred: none'
  -------------------------
  Bands | supported: 'unknown'
           | current: 'unknown'
  -------------------------
  IP | supported: 'ipv4, ipv6, ipv4v6'
  -------------------------
  SIM | path: 'none'

  -------------------------
  Bearers | paths: 'none'

Output of ModemManager --debug in attached mm.log

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.