Please look at:

Simple mixer control 'Channel Mode',0
  Capabilities: enum
  Items: '2ch' '6ch'
  Item0: '2ch'

Notice how it's still set to '2ch'. You need to change it to '6ch'
using the following command in a Terminal:

amixer set 'Channel Mode' '6ch'

-- 
no surround ALC662 karmic
https://bugs.launchpad.net/bugs/469611
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