I have a Huawei usb dongle and after a power cycle reboot all appears
good:-

dave@withycombe:~$ uname -a
Linux withycombe 4.4.0-30-generic #49-Ubuntu SMP Thu Jun 30 20:51:32 UTC 2016 
x86_64 x86_64 x86_64 GNU/Linux

dave@withycombe:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 16.04 LTS
Release:        16.04
Codename:       xenial

dave@withycombe:~$ lsusb
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 004: ID 8087:0a2a Intel Corp. 
Bus 001 Device 003: ID 05e3:0610 Genesys Logic, Inc. 4-port hub
Bus 001 Device 005: ID 12d1:155e Huawei Technologies Co., Ltd. 
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

dave@withycombe:~$ ls -l /dev/ttyU*
crw-rw---- 1 root dialout 188, 0 Jul 12 09:07 /dev/ttyUSB0
crw-rw---- 1 root dialout 188, 1 Jul 12 09:07 /dev/ttyUSB1
crw-rw---- 1 root dialout 188, 2 Jul 12 09:08 /dev/ttyUSB2
dave@withycombe:~$ 

However if I issue the command 'sudo reboot' then look at the system I
don't get the /dev/ttyU* devices created. To be honest this bug is also
complicated by fact that my Intel NUC computer does not always come back
after a reboot. But that's a separate issue.

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https://bugs.launchpad.net/bugs/1435028

Title:
  Kernel does not detect already connected USB devices on boot

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