I connect a 9 in 1 Hub via USB-C to my Thinkpad and by using a HDMI cable connect my LG Monitor to the HUB.
Problem is this: I lose sound frequently, I've tried many things, installing pavucontrol , resetting outputs, using codes like :
alsactl restore and
pulseaudio -k , running
alsamixer to check if the output has been muted ... sometimes the sound get backs but most of the times NOT, even sometimes doing nothing the sound works again!!!
Almost always I can set back the sound output to the Built-In Speakers and it works, but Monitor Speakers stay out of the reach.