Comment 22 for bug 139832

Additionally, it even occurs when not using NetworkManager. I set /etc/network/interfaces to take over the config for wlan0, so that nm would not touch it. Furthermore, this was even after I deleted the network interface entry in /etc's 70-persistent-net file which had allocated the device name 'ra0' for the card. Upon reboot, it was reassigned 'wlan0' instead, but this made no difference...