I have fixed the problem for my dell inspiron 9300 with the following
script syncing the volumes of the master channel with those of the
subwoofer and the headphones. I have added the script to the startup
programs.

#!/bin/bash

while true
do
        A=`amixer sget 'Master' | grep "Front Left: Playback"`
        A=${A:23:2}
        amixer sset 'Master Mono' $A unmute
        amixer sset 'Headphone' $A unmute
        sleep 0.3
done


** Attachment added: ".subwoofer.bsh"
   http://launchpadlibrarian.net/52074857/.subwoofer.bsh

-- 
Volume control doesn't lower subwoofer volume on a Dell Inspiron 9300
https://bugs.launchpad.net/bugs/368973
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