@Paxi said in RetroPie on Ubuntu Mate 20.4.01 HDMI sound issue:

there is only a 32bit version available.

RetroPie has only experimental support for 64 bit on the Pi, using the Raspberry OS 64 bit beta version.

Isn't there anything more I could try, specifically in RetroArch/Pie config?

You can try to disable PulseAudio and make sure RetroArch uses ALSA.

Thanks.

If there's anything you can just point me to that I can try to look at for a fix, I'd appreciate it.