Comment 54 for bug 1585863

Fresh 16.04.1 install on ThinkPad X1 carbon 3 with stock Intel 7265 (802.11abgn) WiFi here; laptop also has a Sierra Wireless EM7345 4G LTE WWAN integrate USB module.

Typical scenario: I use the WWAN when out and about, suspend the laptop, come back to office and expect the laptop to re-connect to WiFi. Typically the WWAN reconnects but the network mgr applet shows a stale list of WiFi access points (looks like they're from when I last suspended the laptop). Kern.log has below notices after resume from sleep regarding the WLAN adapter [1]

I tried the following (several times in a row) from the above suggestions to restore my connection (in assumed descending order of "invasion"):

1. sudo wpa_cli scan
2. sudo rfkill block wifi; sleep 3; rfkill unblock wifi
3. sudo systemctl restart network-manager.service

#3 did it this time but there was definitely a previous occurrence where it didn't help and only a reboot did.

Just in case this helps shed some light on this lengthy thread. Would agree that this isn't Ubuntu's finest hour; sorry I cannot be more constructive.

[1] ken.log
Jan 6 10:31:49 cinamon5u NetworkManager[1270]: <info> [1483695109.4803] device (wlp4s0): state change: unmanaged -> unavailable (reason 'managed') [10 20 2]
Jan 6 10:31:49 cinamon5u kernel: [ 3239.333883] IPv6: ADDRCONF(NETDEV_UP): wlp4s0: link is not ready
Jan 6 10:31:49 cinamon5u kernel: [ 3239.432191] IPv6: ADDRCONF(NETDEV_UP): wlp4s0: link is not ready
Jan 6 10:31:49 cinamon5u NetworkManager[1270]: <info> [1483695109.8678] device (wlp4s0): supplicant interface state: starting -> ready
Jan 6 10:31:49 cinamon5u NetworkManager[1270]: <info> [1483695109.8679] device (wlp4s0): state change: unavailable -> disconnected (reason 'supplicant-available') [20 30 42]
Jan 6 10:31:49 cinamon5u kernel: [ 3239.721341] IPv6: ADDRCONF(NETDEV_UP): wlp4s0: link is not ready
Jan 6 10:33:19 cinamon5u NetworkManager[1270]: <info> [1483695199.5763] device (wlp4s0): state change: disconnected -> unavailable (reason 'none') [30 20 0]
Jan 6 10:33:23 cinamon5u kernel: [ 3333.131109] IPv6: ADDRCONF(NETDEV_UP): wlp4s0: link is not ready
Jan 6 10:33:23 cinamon5u NetworkManager[1270]: <info> [1483695203.3310] device (wlp4s0): supplicant interface state: starting -> ready
Jan 6 10:33:23 cinamon5u NetworkManager[1270]: <info> [1483695203.3311] device (wlp4s0): state change: unavailable -> disconnected (reason 'supplicant-available') [20 30 42]
Jan 6 10:33:23 cinamon5u kernel: [ 3333.175963] IPv6: ADDRCONF(NETDEV_UP): wlp4s0: link is not ready