microphone on acer one D255 doesn't works

You are making all the correct checks.

Your screen prints did confuse me. It looks like some come from “stereo duplex” and others from “analog stereo output” so I can not confirm correct.

Your comment about the various arecords confused me. I have not recommended those. I’m not sure what I am supposed to read into them. I recommended:


arecord -vv -f S16_LE -c 2 -D hw:0,0 new.wav

where one explicity defines the input device to use. Please confirm that DOES record audio.

I REALLY NEED the output of the script


/usr/sbin/alsa-info.sh

please do not give up on getting that to work. Run it with pc connected to internet, select share/upload option, and post here URL it provides. Do you need more guidance on how to get that script to work ?