Thanks, resolution 10/10, will report issues again.
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https://bugs.launchpad.net/bugs/1850646
Title:
Sound output device switched on DP/MST connect
To manage notifications about this bu
Switching on connect is an intentional design choice for Ubuntu. If you
would like to disable it then please just comment out this line:
load-module module-switch-on-connect
in /etc/pulse/default.pa
So this isn't a bug, but it does seem to overlap with bug 1847570 so
please see that too.
** P