This was one of the first things I tried. I have literally went through one thread after another on this issue with BOTH Ubuntu and Pop. Literally probably 60ish different threads. TONS of different things. I gave up and returned it.
So hear me out. I have a new Zenbook S OLED and its amazing. However, I have the sound issue where I only have sound coming from the headphones but not speakers.
This seems pretty common on New laptops. I installed Pop and Ubuntu both on it and had same issue. Took same ISO file and installed it...