Hi, I finally solved the issue. 
All I did was to run alsamixer, and put all the items to 100% (Master, PCM, LFE)

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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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