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Mic not recognized and Dummy output in ubuntu 20.04. ThinkPad X1C 7th Gen

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After doing some maintenance on my laptop, the built-in speakers and mic stopped working in ubuntu, giving me "dummy output" as the sound output. The same happens in a Live USB session of ubuntu 20.04. In windows it works fine, so i think it isnt a hardware problem. I solved the audio issue with the second solution of this tutorial. But i cant find a similar solution for my mic problem.

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