[alsa-devel] Microphone detected, but no output for all ASUS G751xx with ALC668 chipset

[Håvard]

Additional relevant info:

A similar issue was also discussed three years ago on Sun Jun 17:15:54 CEST
2015 and was about his surround sound setup, but did not touch on the
external microphone problem:
http://mailman.alsa-project.org/pipermail/alsa-devel/2015-June/093317.html

alsa-info.sh:
http://www.alsa-project.org/db/?f=1d8616ba5977308e03db6c3a86e36e9e9b38d6f0

Graph of ALC668 chipset from hdaanalyzer:
http://i.imgur.com/c08DNJW.png

setting alsa-mode[1-8] does nothing to help the issue.

There are several of similar bug reports around the web experiencing
similar issues, and on different distros.

Microphone works perfectly in windows

I have a ASUS ROG G751JT, but this problem seems to happen with all laptops
under the G751 name.

These are my kernel configs:
https://paste.pound-python.org/show/GRk4T6xNvmdp8W7K9slJ/

Thank you!
-Håvard