dummy output (no sound from internal speakers) Dell XPS 13 9315 ubuntu 22.04 LTS

I used to have ubuntu 20.04 LTS but on November 11 or, the day before, I decided to run the so classic

sudo apt update && sudo apt upgrade

Result was my internal speaker was not working anymore so I thought, in vain, that moving to 22.04 LTS would solve the problem.