[ubuntu] Ubuntu 9.10 Acer8930G sound/surround sound

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http://ubuntuforums.org – Don't no where to start. I have an Acer 8930G Laptop. Testing Ubuntu 9.10 32bit Intel core 2 DUO (2.0GHz) T6400 3GB Ram There is no stereo sound it is mono, if i move the balance slider left to right it moves the sound front to rear. if i select 5.1 surround sound will only come out of the LFE (Subwoofer). Any body got any ideas. (Hardware)