Same issue for me, same Inspiron 9400.
Also is the issue that the sound plays on the subwoofer speaker and not on the 
main speakers a duplicate with Bug 441195 ? In fact it happens only with ouput 
= Analog Stereo. No sound at all with output = Digital Stereo (IEC958)

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When playing a sound on my laptop, the sound works well on the headphones, but 
not on the laptop's speaker. When I increse the volume, it doesn't increase 
progressively but jerkily. Moreover, the sound plays on the subwoofer speaker 
and not on the main speakers. 
https://bugs.launchpad.net/bugs/458056
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