Sound playback in Audacity has never worked for me in recent memory: no sound plays, but the equalizer in the UI throbs. This has been the case for several years across a couple of Ubuntu versions and machines. This obviously basically makes the software unusable.
Audacity shows a bunch of output devices in the UI, and none of them work. There's one called hdmi, and then five more called HDA Intel PCH: HDMI n (hw:0,m) for various values of n and m. I've tried with the built-in laptop speakers, and I've tried with headphones plugged in (via a simple audio jack). Nothing works.
This is very strange to me because this is not a minor problem, and Audacity is not an obscure piece of software, but I don't see a lot of chatter about this problem on the internet. What's going on?
Ubuntu 20.04, Audacity 3.1.3.