Comment 12 for bug 1556357

I've run into this with my x220 which was recently upgraded to Xenial as well. It is not consistent; it happens at maybe 1 out of 3 suspend/resume cycles.

Removing and reinserting the iwldvm module also fixes the issue, but kudos to Haw for noting that it doesn't seem to be a lower-level bug but rather in NM itself; as he suggests, a `sudo wpa_cli resume` triggers a reconnection.

Toggling the kill switch does not cause a reconnection to happen, nor does disabling and reenabling wifi.

The UI symptom is that the list of available networks in the dropdown does not update; either a single item or no item is displayed, and no reconnection happens (regardless of whether or not the item displayed is one which you have associated with before).