Christian,the failure occurs to me even in a stationary scenario, it
does not occur at all suspend/resume cycles, but randomly. (I could not
establish a pattern anyway)

In fact, what you described never occured to me, the network-manager UI
doesn't show a stale list of wifi networks. In my case the list of
access points appears empty and thus cannot connect to any.

Running the wpa_cli scan command, or wpa_cli resume, or restarting the
networkmanager, makes the access points reappear and the connection is
instantaneous with the preferred network.

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https://bugs.launchpad.net/bugs/1585863

Title:
  WiFi malfunction after suspend & resume stress - sudo wpa_cli scan
  required to fix it.

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