Please see the following mixer controls (which you can change by using
`alsamixer` in a Terminal):

Simple mixer control 'AC97 2ch->4ch Copy',0
  Capabilities: pswitch pswitch-joined penum
  Playback channels: Mono
  Mono: Playback [off]  <--- probably needs to be unmuted
Simple mixer control 'Channel Mode',0
  Capabilities: enum
  Items: '2ch' '4ch' '6ch'
  Item0: '2ch'  <--- probably needs to be set to '6ch'

Simple mixer control 'Duplicate Front',0
  Capabilities: pswitch pswitch-joined penum
  Playback channels: Mono
  Mono: Playback [off]  <--- probably needs to be unmuted

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

-- 
[FM801 - ForteMedia FM801-AU] Playback problem
https://bugs.launchpad.net/bugs/671087
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