Here is an automute bug for an Aspire 5920 (non-G): 
https://bugs.launchpad.net/bugs/994953
I'm not marking it duplicate since the systems are slightly different, but they 
both have Realtek ALC1200 chips and I'm guessing the solution will be the same 
for both.

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https://bugs.launchpad.net/bugs/1034041

Title:
  [Aspire 5920G, Realtek ALC1200, Black Headphone Out, Front] No
  automute

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