Solved!
Unexpectedly the issue is resolved already by following the steps here (sorry I can’t post a link here apparantly)
The solution was on a website about Manjaro, Clevo Laptop and no sound.
Put the following configuration in /etc/modprobe.d/alsa-base.conf.
options snd-hda-intel model=clevo-p950 probe_mask=1
I was not sure what model my Clevo is, but this line made the sound working.
I consider Oleksandr Halushk my friend now 
Maybe someone else can use this question plus solution in the future.