Same problem here. If I kill wpa_supplicant after resume then most of the times
NetworkManager works again.
Nothing in the logs about any errors can be found. (K)NetworkManager tries to
connect, sometimes it connects but the connection is lost right after that
again. Sometimes it isn't possbile
It seems related to dbus and Network Manager. Restarting this service
makes Network Manager work again.
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Suspend / Hibernation crash wpa_supplicant
https://bugs.launchpad.net/bugs/105778
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