I am using a Thinkpad T420 in a docking station. I use the audio out of the
docking station. When I play music the sound is working fine coming from the
docking station. However, when I plug in my headphones to the Thinkpad audio
out I expect that the sound of the docking station is muted but sound is then
coming out of both, the docking station and headphones. This was working with
openSUSE 13.1.

Furthermore when I unplug the audio of the docking station and headphones I
expect that the Thinkpad speakers are used. However, this only works when I
plugout the audio of the docking station as last. When I plug out the
headphones as last the speakers are muted.