Yesterday I installed Xubuntu 20.04 in an HP ProBook 430 G7. Today I joined a Zoom meeting and cannot hear the audio, no matter what I try. As can be seen in the pictures below, the Zoom stream "has sound" (the orange bar moves as people speaks) and it is directed to the HDMI3/DP3 output (I don't exactly know what this is, why are there 3 HDMI audio outputs?). If I try to redirect the Zoom audio stream to the Speaker+Headphones (as is the Firefox stream, which works perfectly) it does nothing. I mean, if I click where the mouse is in picture 2, nothing happens. I have tried to unplug the HDMI screen, same result. I have tried to plug the headphones in the screen headphone connector, no audio at all there. Ideas?
Finally after some time I found that I can change this configuration within Zoom. It seems that Zoom locks itself to some audio output and the OS is not able to change it.
After connecting the HDMI cable, on computer volume select your computer system e.g. Samsung (Nvidia high definition audio)... Then in Zoom (by mic) go to select a speaker then click "same as system".