No sound on PBP default installation

[ivek]

Hi,

I just received the PBP with preinstalled Debian + Mate. everything is more or less fine, except that the sound doesn't work at all:
 - neither on speakers, nor on headphones
 - in Alsamixer no setting helped me, when trying to set output to default, the Alsamixer aborts and I can't rerun it
 - I tried checking sound from "control panel", I think there is no connection to Pulseaudio (but Pulseaudio is installed)
 - when I play a song (no sound ofcourse), one setting in volume control says that there is no app playing the sounds, although it's playing.

I haven't tried to update anything, I don't know the commands.
I don't know if I need maybe to set that UART switch if set to off, but I need to open the laptop for that. (as in thread https://forum.pine64.org/showthread.php?tid=8231)
I haven't tried it on HDMI, I don't see that port, only UCB-C, if it is meant for HDMI, I have no adapter to try..

I am pretty much a noob in Linux, so any help with an elaborated answer (links to explanations like "how to install or try out a new OS") would be appreciated