The Problem is really in NetworkManager.
Via wpa_supplicant it's possible to log in an unsecured adhoc network.
For that you only have to set in the wpa_supplicant.conf ap_scan=2 and in the
regarding network section mode=1
For example:
ctrl_interface=/var/run/wpa_supplicant
eapol_version=1
ap_scan=2 #2 for Ad-Hoc networks
network={
ssid="www.openwireless.ch"
scan_ssid=1
key_mgmt=NONE
mode=1 #0 managed, 1 ad-hoc, 2 acces point
}
So I guess NetworkManager doesn't set one or both of the needed
settings. Since as far as I know, NM utilises wpa_supplicant for the
network connection.
In the nm-connection-editor the modus is set to Ad-Hoc in the respective
Wireless-Network setting.
The used driver with wpa_supplicant (-D) was wext.
--
Network manager can't connect in AD-HOC network
https://bugs.launchpad.net/bugs/523776
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