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Intel WiFi stopped working after applying dnf-plugin-fedup

Dear Fedora enthusiasts,

after manually upgrading my Fedora 21 system to Fedora 22 via the new systemd offline upgrade method (see wgwoods/dnf-plugin-fedup#1 for details), my WiFi became inaccessible.

iwlist scan shows all WiFi's in the area, but GNOME's NetworkManager Applet doesn't recognize them. It just says not working.

The machine is a Sony VAIO Pro 13 with known WiFi issues, booting from an inserted rEFInd. Yet it worked before.

Where can I look for the disconnect of GNOME and the WiFi device. Does this have to do with a deprecation of wpa_supplicant in F22?

Greetings from Berlin,