Just found this work-around (Dell 7790 17" G7 Gaming Laptop):
1. Sleep
2. Unplug the audio device from jack
3. Resume
4. Plug the audio device to jack
Works.

Seems to be a power management issue (and Dell only).
Resume with the audio device plugged into jack makes the jack silent until next 
resume with no audio device plugged into jack.

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https://bugs.launchpad.net/bugs/1583801

Title:
  No sound via headphones (headset) when Ubuntu boots with them plugged
  in

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