Comment # 3 on bug 1047857 from Markus Greger

I've found a similiar bug somewhere (link lost, sorry) and that pointed towards
wpa_supplicant.

Thus I tried different combinations, including old ones, as it did work in
OpenSuse 13.x.

Ideed it seems a wpa_supplicant problem, as it is working fine with a version
copied over from OpenSuse 13.x.

I'm now running NetworkManager from Tubleweed and wpa_supplicant from OpenSuse
13.x

My reasoning for this choice were
- changes in NetworkManager to improve mac address randomization which are only
in 1.6 and newer https://bugzilla.gnome.org/show_bug.cgi?id=770611#c4
- wpa_supplicant from Tumbleweed needing further changes
- working wpa_supplicant from openSuse 13.x

Thus it looks like as if some of the - may be already old - security fixes
introduced a problem for me.