Version: (using KDE 4.4.0) OS: Linux Installed from: Ubuntu Packages When knetworkmanager plasmoid starts, it priorizes and connects to DHCP networks when DHCP is available and not to the network with parameters defined by the user. It should give priority to the LAN networks defined manually with the option "connect automatically" active. If I deactivate DHCP in the router, then knetworkmanager connect to the right network. I've only tested with LAN type networks.
This is a side effect of http://bugs.kde.org/204340 . Networkmanager always creates system auto-connect connections for wired connections and they have priority over user connections (the ones created using Plasma NM). Once editing system connections patch is commited you will be able to edit them to not auto connect.
*** Bug 259583 has been marked as a duplicate of this bug. ***
*** This bug has been marked as a duplicate of bug 222563 ***