Huawei ME909u, lte capabilities not reported by ModemManager (yet, it connects to lte)

[José]

I am using a the Huawei ME909u, a modem with lte capabilites, with
ModemManager. Using mmcli -m 0 shows only 'gsm-umts' capabilities,but
it reports that the device is connected to a lte netwokr.

root at ccimx6sbc:~# mmcli -m 0

/org/freedesktop/ModemManager1/Modem/0 (device id
'f1f88882f8d5d70ed30e060f6e0f9b2d149b1a5f')

  -------------------------
  Hardware |   manufacturer: 'Huawei Technologies Co., Ltd.'
           |          model: 'ME909u-521'
           |       revision: '11.234.77.00.00'
           |      supported: 'gsm-umts'
           |        current: 'gsm-umts'
           |   equipment id: '860461024718192'
  -------------------------
  System   |         device:
'/sys/devices/soc0/soc.1/2100000.aips-bus/2184200.usb/ci_hdrc.1/usb1/1-1/1-1.3'
           |        drivers: 'option1, cdc_ether'
           |         plugin: 'Huawei'
           |   primary port: 'ttyUSB2'
           |          ports: 'eth1 (net), ttyUSB0 (at), ttyUSB2 (at)'
  -------------------------
  Numbers  |           own : 'unknown'
  -------------------------
  Status   |           lock: 'none'
           | unlock retries: 'sim-pin (3), sim-pin2 (3), sim-puk (10),
sim-puk2 (10)'
           |          state: 'connected'
           |    power state: 'on'
           |    access tech: 'lte'
           | signal quality: '60' (recent)
  -------------------------
  Modes    |      supported: 'allowed: 4g; preferred: none
           |                  allowed: 3g; preferred: none
           |                  allowed: 2g; preferred: none
           |                  allowed: 2g, 3g, 4g; preferred: none'
           |        current: 'allowed: 2g, 3g, 4g; preferred: none'
  -------------------------
  Bands    |      supported: 'unknown'
           |        current: 'unknown'
  -------------------------
  IP       |      supported: 'ipv4, ipv6, ipv4v6'
  -------------------------
  3GPP     |           imei: '860461024718192'
           |  enabled locks: 'sim'
           |    operator id: '21404'
           |  operator name: 'YOIGO Yoigo'
           |   subscription: 'unknown'
           |   registration: 'home'
  -------------------------
  SIM      |           path: '/org/freedesktop/ModemManager1/SIM/0'
  -------------------------
  Bearers  |          paths: '/org/freedesktop/ModemManager1/Bearer/0'


The modem works properly with showing 4G-like speed.

I have tried updated the firmware and the behaviour is the same.

Seems like a ModemManager bug to me, so I am reporting just in case.

Here is the complet debug log: http://pastebin.com/zs6uJXVK