ok, so it seems to be a variant of the forementioned bugs.  The docking
station makes it behave diferently.

http://accessories.us.dell.com/sna/productdetail.aspx?c=us&l=en&sku=430-3113#Overview

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Internal speakers are not disabled if speakers are plugged into E-Port  docking 
station (Dell Latitude E6400) 8086:293e Codec  IDT 92HD71B7X
https://bugs.launchpad.net/bugs/383756
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