[Bug 77557] Re: knetworkmanager fails to find network devices

[Daniel Cejka]

Working from sk0rp10s tips above I have found the following:

First of all: Problem description, as it is a little different. At some point I did something stupid, probably turning off the transmitter (easily done on a Dell D600 by hitting Fn-F2 instead of Alt-F2 :-(  ). This got knetworkmanager confused and me in a state of panic. I reconfigured the wireless settings through systemsettings, and poof! the wireless network device was gone from knetworkmanager.
The system as such worked, but I was now unable to switch networks easily when going from one location to another, and knetworkmanager gave the familiar "no active device found" message.

My solution:
Not only do you need to set wlan0 back to auto, but you also need to give it _empty_ authentication details, like so:

auto wifi0
iface wifi0 inet dhcp
wireless-essid
wireless-key

This makes the available network list magically reappear and I am yet
again able to switch WLANs via knetworkmanager. Peace of mind finally
restored; this has been bugging me for a while :-)

-- 
knetworkmanager fails to find network devices
https://bugs.launchpad.net/bugs/77557
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