Ok, so I sent some emails to the author of the patch.
He suggested me to try kernel v3.9 since drivers are quite different. But since 
installing custom kernels would avoid me for receiving support, I cannot do 
this for now.
He also suggested hda-analyzer, but as I'm not really a tech-guy, I rather keep 
my hands off there since I wouldn't know what I'm doing.
Another suggestion was to figure out pin configuration, again, above my 
possibilities.
So, I guess it'll be another 6 months until new kernels are provided from 
Canonical...
But, if there's still the possibility for a turnaround, please let me know, and 
how can I help.
Thanks.

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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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