I've installed Ubuntu Mate 20.04 on my Pi 4, and I don't seem to have HDMI sound.
I've tried ScummVM and YouTube and neither work. Looking at other posts, I've added the below to my usercfg.txt, from reading other threads they seemed to help some people.
hdmi_force_hotplug=1
config_hdmi_boost=4
But still no joy.
I have the following in my config.txt by default:
param=audio=on
hdmi_drive=2
Any help would be appreciated. I have sound working on RetroPie and Raspian.
The monitor I am using is a Samsung 22 inch.