Apparently it's not just us, this is an upstream change. Dave Jones
found this: https://www.raspberrypi.org/blog/latest-raspberry-pi-os-
update-may-2020/
To select headphones, the recommended process is now to create a file called
.asoundrc in your home dir with these contents:
defaults.pcm.card 1
defaults.ctl.card 1
** Changed in: linux-raspi (Ubuntu Focal)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1889468
Title:
20.04.1 selecting audio output device does not work on rpi
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