[Bug 1693756] Re: [Xenial][ DW5816e] to support qmi over mbim which needed for FCC authentication.

[Alfonso Sanchez-Beato]

After chatting with sil2100, he said that potentially we could backport
artful 1.6.8 modemmanager to xenial, which would be great. I have
created bug #1725190 to track that and start in a clean state from
there.

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Title:
  [Xenial][ DW5816e] to support qmi over mbim which needed for FCC
  authentication.

Status in ModemManager:
  New
Status in OEM Priority Project:
  Triaged
Status in OEM Priority Project xenial series:
  New
Status in modemmanager package in Ubuntu:
  Confirmed

Bug description:
  # issue:
   * wwan card DW5816e[413c:81cc] couldn't be recognized by modemmanager 1.4.12-1ubuntu1 on xenial.
    - but works well on on Yakkety.

  # investgation:
   * in failed case, mmcli -L shows nothing on Xenial with DW5816. Then tried install followed packages from Yakkety ppa on Xenial and wwan card works on 1st boot but failed after 2nd boot sometimes.
    - libmbim-glib4_1.14.0-1_amd64.deb
    - libmbim-glib-dev_1.14.0-1_amd64.deb
    - libmbim-proxy_1.14.0-1_amd64.deb
    - libmbim-utils_1.14.0-1_amd64.deb
    - libqmi-glib5_1.16.0-1_amd64.deb
    - libqmi-proxy_1.16.0-1_amd64.deb

   * different from ModemManager --debug
     - In passed case, it received message from /dev/cdc-wdm1 after send "Read max control message size from descriptors file: 4096" , but not happens to failed case. So, it prints "[mm-port-probe.c:261] mm_port_probe_set_result_qcdm(): (tty/ttyS4) port is not QCDM-capable" in failed case.
       - passed case: http://paste.ubuntu.com/24664908/
       - failed case: http://paste.ubuntu.com/24664910/

  # Plan:
   * let the newer version packages could also works well on Xenial.
   * find out needed patches on newer version packages.
   * packport needed patches to older version packages on Xenial.

  # environment information:

   * modinfo cdc_mbim for original kernel module: http://paste.ubuntu.com/24662359/
    - the code /driver/net/usb/cdc_mbim.c is the same between xenial kernel 4.4.0 and yakkety kernel 4.8.0.

   * uname -r: 4.4.0-73-generic

   * lsusb -v: http://paste.ubuntu.com/24662332/

  FCC authentication reference:
   * http://lists.infradead.org/pipermail/lede-dev/2016-August/002332.html
   * https://lists.freedesktop.org/archives/libmbim-devel/2016-April/thread.html#704

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