I have a Dell Latitude D620 and a D-Port replicator and had never succeeded in getting the sound jack on the dock to work. I found a solution on Ubuntu forums: http://ubuntuforums.org/showthread.php?t=80193
Its quite simple. You just have to enable IEC958
- Open Volume control
- If you dont see the “Switches” tab:
- Click Preferences and check “IEC958″
- Open the Switches tab and Check the “IEC958″.
The jack in the dock seems to be a “line-out” so you can’t use Alsa to change the volume. So if you have earphones without volume control – you should continue to plug it into the jack on the computer.