I just studied the PulseAudio 13 release notes and it is probably related to the following "improvement" ...
::Automatically switch away from unavailable card profiles:: How about restoring the profile when it becomes available again? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1905080 Title: After upgrading from Ubuntu 18 to 20 pulseaudio starts with HDMI output disabled and doesn't turn on when I turn on the TV To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1905080/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
