[No change - copying the file in the same dir adding .bak is sufficient
right- or will this be read as a 2nd conf?]

adding .bak is ok, after reboot, you can run pactl list cards to verify if the 
change takes effect or not.
Before change: 
       Profiles:
                output:analog-stereo-speaker: Speaker (sinks: 1, sources: 0, 
priority: 60, available: yes)
                output:analog-stereo-headphone+input:analog-stereo-mic: Headset 
(sinks: 1, sources: 1, priority: 80, available: yes)
                off: Off (sinks: 0, sources: 0, priority: 0, available: yes)

After change, the 1st two profiles disappear.


If the change takes effect, but it still can't work, I think it is not a 
pulseaudio issue, probably the firmware issue of dock or kernel driver issue.

And you can verify by these commands:

aplay -D plughw:CARD=xxx,DEV=0 test.wav (replace xxx with the name of usb audio 
card, aplay -L to check the name of usb audio card)
aplay -D plughw:CARD=xxx,DEV=1 test.wav


And BTW, what does "the vanilla ones from upstream" mean?

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https://bugs.launchpad.net/bugs/1772383

Title:
  WD15 Dell Thunderbolt dock no audio

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