Hello luke32j !
I installed the system from the '64bit+mac' distribution image. If this is the 
reason for the sound working, maybe it can be confirmed from one of the guys in 
charge here. However, there's clearly some bug in the drivers.

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https://bugs.launchpad.net/bugs/1070543

Title:
  [MacBook4,1, Realtek ALC889A, Speaker, Internal] Only right bass
  speaker is working, left is not.

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