hi, i have acer 5920 too and I had the same problem, but solution is very 
simple:
click right-button on master of sound - right-top corner near the clock->Open 
Volume Control->Edit->Preferences
then in new in appeared window turn on "surround", turn it on on Volume control 
and push it up) 
enjoy! this is for ubuntu 8.04 i386 
Sorry for my English

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No sound  Acer 5920
https://bugs.launchpad.net/bugs/245467
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