I can confirm that #19 works, as well. Also applied the suggestions in #24.
Ubuntu 17.10 on a Lenovo Ideapad Y910-17ISK with a GTX 1070.
I don't notice any flicker or any problem. The audio device has just appeared, 
and everything works fine now :-) 
Thanks a lot!!

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https://bugs.launchpad.net/bugs/1377653

Title:
  HDMI sound output not detected / NVIDIA optimus laptop

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