For some reason the microphone isn't recognized. It was working without problems in Ubuntu 23.04. I'm using a Lenovo YOGA 7 14ARB7 (AMD Ryzen 6800U) and I was positively surprised that the speakers were working right away with Ubuntu 23.10, since I still had to do some fixes in 23.04. 
I checked several other articles now and they were dealing with older models or Ubuntu versions... The microphone worked without any issues on Ubuntu 23.04.
 
    
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3 Answers
I had the same issue, and I found a workaround to make microphone work. You can read this thread on french ubuntu forum : https://forum.ubuntu-fr.org/viewtopic.php?id=2081994
Simple process :
1/ Get kernel 6.6 (https://www.kernel.org/)
2/Compile et install kernel 6.6 as dscribed : https://davidaugustat.com/linux/how-to-compile-linux-kernel-on-ubuntu
Actually, I have no explanation why it works, but it works :-D
Hope it will help you.
 
    
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The problem also occurred after updating from 23.04 to 23.10. After trying many solutions online that were not working, I attempted to use GPT4 to help me solve the issue.
Eventually, I executed sudo apt-get remove --purge alsa-base pulseaudio.
Afterwards, the system recommended me to install two other packages to replace these two, they seemed to be pipewire-pulse and pipewire-alsa. After restarting the system, my built-in audio device was back to normal.
I'm not sure what effects this might have, it could potentially impact software that uses pulseaudio to process audio. If other solutions don't work for you, you can try this one.
 
    
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I had the same problem and fixed it by running the below commands.
sudo apt-get remove — purge alsa-base pulseaudio
sudo apt-get install alsa-base pulseaudio
sudo alsa force-reload
This will stop and restart the PulseAudio sound server and reload the ALSA sound driver. You might need to restart for it to take effect.
 
    
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