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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HDMI sound output not detected / NVIDIA optimus laptop
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