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TRRS Headset mic issue help


Hi all. Im having an issue with the Macbook Pro TRRS combo port not
recognising the microphone (speakers works) and I'm wondering if anyone
here has time to guide me a bit with trying to fix this issue.

I filed a bug report earlier:


And i have found another report with the same problem on the same chipset
here with a bit more info:


I have installed the latest ALSA from:

So where do I go from here? Any more info I can add?

Best regards, Mikael Berglund