Public bug reported:

With DW5811e(EM7455), mobile data connection not show on nm indicator
after logout -> login.

packages which be used:
network-manager: network-manager_1.2.2-0ubuntu0.16.04.3_amd64
nm-applet: network-manager-gnome_1.2.0-0ubuntu0.16.04.4_amd64

Steps to reproduce:
1. boot device with 4G sim card + DW5811e(EM7455) wwan card
2. check nm-applet indicator then "Mobile Braodband" could be found in menu in 
normal cases.
3. logout then login
4. check nm-applet indicator then "Mobile Braodband" not shows in menu anymore.
5. but still could connect to wwan by nmcli, so looks device and networkmanager 
work fine.

investigation:
* In nm-applet, it caused by device-added signal comes before mm_new_ready() 
which is the call back of mm_manager_new(). And that asynchronous way was added 
by 408b88cc (Dan Williams 2014-05-01:
http://paste.ubuntu.com/23639247/
* revert 408b88cc fixed this issue.

** Affects: network-manager-applet (Ubuntu)
     Importance: Undecided
         Status: New

** Summary changed:

- nm-applet not show wwan options on menu after logout/int
+ nm-applet not show wwan options on menu after logout/in

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https://bugs.launchpad.net/bugs/1651019

Title:
  nm-applet not show wwan options on menu after logout/in

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