Uninstalling pipewire fixed my audio problems. Now I can plug in headphones get sound, unplug them and get onboard sound, as it used to work!
Running Kubuntu 20.10, installed pipewire : apt show pipewire Package: pipewire Version: 0.3.10-4 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1897965 Title: PulseAudio doesn't work when pipewire is installed (ie. KDE) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/pipewire/+bug/1897965/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs