Output through HDMI

I can get hdmi output to TV from xubuntu, and Ubuntu, with no issues, but not Ubuntu Mate. This is a deal breaker for me, and i will have to move distros unless some one can help me resolve this issue with mate.

many thanks in advance for any help.
I am using Mate 21.04

This sure sounds a lot like an incident from about six months ago:

The solution that worked at the time was to uninstall Timidity. But that doesn't mean you should go willy-nilly uninstalling Timidity yet! First show us the output of the command cat /proc/asound/cards. Then show us the Sound Settings dialog, under at least the "Output" tab and preferably also the "Hardware" tab.