I have a Steam deck, and one of OS on it is Ubuntu Mate. Deck is known to have problems with audio on various linux distros --- it works only on kernel 6.1+, headphones are quiet, speakers don't work at all. I googled for solution of this problem, and multiple people said that they solved their problems by modifying some numbers in alsamixer. I decided to give it a try. However, the moment I opened sound card in alsamixer, sound (in headphones) disappeared, and i had only dummy sound output. After reboot normal sound outputs returned, but sound in headphones - not. Pavucontrol shows
that output device gets some sound, but nothing is coming out of headphones. Well, nothing from speakers too, but it was like that from the beginning.
Problem is not in hardware, as headphones work ok in windows and steamos. Not sure what to try next, though?