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I'm using Ubuntu 20.04 on an HP da0077tx laptop and my headset's mic is not working on ubuntu. The same headset is working fine with other devices.

Audio Codec: Realtek ALC236

This Audio codec is not available on https://www.kernel.org/doc/html/latest/sound/hd-audio/models.html

I have my interviews next week and this issue can create a problem. Any help will be greatly appreciated.

Only built-in mic is detected

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if it's listed, then open up terminal and type alsamixer then navigate to your headphones and turn up the volume, if the volume is all the way up, but there's no sound, then go there again and look if it's saying "OO" or "MM" under the volume bar, if its MM, then its muted, so press M while having it selected and it should become unmuted.

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I was having a similar problem on Ubuntu 21.04 with my headset's microphone not working. I was able to fix it by replacing Pulseaudio with Pipewire: Replacing Pulseaudio with Pipewire in Ubuntu 20.04

I found that headset audio is really bad when using the HSP/HFP CVSD codec (which is what you have to use to use the headset microphone). To enable the better MSBC codec, uncomment the line that says bluez5.msbc-support = true in /etc/pipewire/media-session.d/bluez-monitor.conf. The audio still won't be as good as if you were using an A2DP codec (no microphone), but it's definitely usable.

Hope this helps.

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