* In the Volume control, click Preferences
* In the Preferences check Import1 Mux
* Close Preferences
* In the new 'Recording'-tab, unmute the microphone.
Sound now comes through the speakers attached to the docking station. It still doesn't mute the speakers on the machine.
I got this to work by following steffen's second post here http:// www.linlap. com/wiki/ dell%20precisio n%20m4400 (the one at Monday 13 of April, 2009 [12:09:14]), but I didn't modify alsa-base.conf.
* In the Volume control, click Preferences
* In the Preferences check Import1 Mux
* Close Preferences
* In the new 'Recording'-tab, unmute the microphone.
Sound now comes through the speakers attached to the docking station. It still doesn't mute the speakers on the machine.