Berserk rage with 5.1 sound

Hello people,

after trying & failing for...4 hours...I need to ask you. I am going crazy with this issue and I can not fix this by myself.
All I want is to get my subwoofer in my Acer Aspire 7738G working. Well, last year I got that working until i removed Linux again, but don't ask me how I managed that.
I tried every possible solution I found through Google, but none of them worked. So please haaalp!

Code:

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speaker-test -Dplug:surround51 -c6 -l1 -twav

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only plays sound from front-right and front-left


kind regarts


b1n0ry

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Linux xxx 3.2.0-48-generic #74-Ubuntu SMP Thu Jun 6 19:43:26 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
BackBox 3.05 / Ubuntu 12.04 / XFCE