Comment 63 for bug 37773

I solved some random wifi-related lockups by uninstalling network-manager and directly configuring wpa_supplicant. I added a bit to the ubuntu wiki https://help.ubuntu.com/community/WifiDocs/WPAHowTo. Basically I just start wpa_supplicant with a pre-up stanza in /etc/network/interfaces rather than using network-manager. This would make sense if KDE doesn't suffer lockups if nm-applet and/or gnome-keyring-daemon etc are at fault.