I can confirm this bug. I also have a Dell Latitude D630, and get no
sound when I plug in my headphones to the audio jack on the docking
station. The headphones DO work on the headphone jack ON the laptop,
even when it is docked.

Here's something I've noticed when the laptop is docked:
-When using the laptop's built-in speakers, I plug headphones into the dock's 
audio jack, and the sound STOPS coming out of the laptop speakers.
-When using the laptop's headphone jack for headphones, I plug another pair of 
headphones into the dock's audio jack, and the sound KEEPS coming out of the 
laptop-jacked headphones but not the dock-jacked headphones.

So, the computer obviously recognizes when to correctly switch to the
dock audio jack, but it doesn't correctly route the audio to that jack.

** Changed in: linux (Ubuntu)
       Status: New => Confirmed

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no sound on Dell D630 docking station
https://bugs.launchpad.net/bugs/307086
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