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I have an Acer Swift 3 SF314-56 with Ubuntu 19.10 installed (the card is a Realtek ALC256).

My microphone does not work. I've tried lot of thing such as put the line "options snd-hda-intel model=acer-headset-multi" at the botton of the file "/etc/modprobe.d/alsa-base.conf". I've also installed HDAJackRetask and connected pin 012 and 013 to internal mic and bot ovveride. I've set Mic_Boost on alsamixer equal to zero.

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Well, nothing worked. The mic is now not dectected at all. Could someone help me?

I missed an infornation. Ubuntu is installed in dual boot alongside windows 10 (which I use rarely). On windows the microphone is detected and works well.

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I am having exactly the same issue. The problem seems to be that the built-in microphones are not part of the Intel HDA, but are connected to another codec. Forcing Linux to enable the (unconnected) microphone input will only result in some hum / system noise. I found more information here:

https://forums.linuxmint.com/viewtopic.php?t=306080

However, don't get your hopes up; as far as I could find, it has not been fixed yet.

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