found a solution, i used the settings advised here : http://www
.backtrack-linux.org/forums/backtrack-5-beginners-section/41508-alsa-
problem-after-successful-update.html

options snd-hda-intel index=0 model=acer-aspire-7730g

now, for the first time i have subwoofer, left and right speaker, all working 
at the same time :)
as positive side effet, volume never was so loud

** Changed in: alsa-driver (Ubuntu)
       Status: New => Fix Committed

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https://bugs.launchpad.net/bugs/796617

Title:
  MSI GX740 - Intel 5/3400 - ALC888 : no sound on right speaker

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