hi ,

this solves your problem:

I) open console
II) su to root
III) run alsamixer
go right with the arrow keys and
1) <Master_S> (Master Surround):
unmute (press m), increase volume (up-arrow key)
2) <PCM>:
unmute (press m), increase volume (up-arrow key)
3) <Channel> (Channel Mode):
set to 4 or 6 (up-arrow key)
4)<Exchange> (Exchange Front/Surround)
unmute (press m)
5)exit 


which is in short:
1) setting channels to 4 or 6
2) enabling exchange front/surround
3) unmuting master/surround and increasing its volume

you can do this with any mixer configuration utility as kmix or
alsamixer.

btw, google is your  friend ;)

-- 
no sound on asus a9t laptop. can't make it work. i got SiS si7012 soundcard 
integrated
https://bugs.launchpad.net/bugs/204794
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