Please try this commit:
commit 855b5e01c0732d66c306cdd5215c3337e5311899
Author: Jaroslav Kysela <pe...@perex.cz>
Date:   Thu Jun 13 15:09:01 2019 +0200

    ALSA: hda/hdmi - consider eld_valid also in sync_eld_via_acomp()

    In the commit 7f641e26a6df9269cb25dd7a4b0a91d6586ed441 (ALSA: hda/hdmi
    - Consider eld_valid when reporting jack event) the eld_valid check was
    added for the jack event reports. Do the same in sync_eld_via_acomp()
    function. Apparently, it is required for the NVIDIA proprietary driver
    (monitor presence reported first, but ELD is available later).

Let me know if you need a prebuilt kernel.

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https://bugs.launchpad.net/bugs/1834771

Title:
  No HDMI-audio after kernel 4.15.-0.50

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