audio_ALC_guides
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No Audio Devices - Guide integration with possible solution
No Audio Devices - Realtek ALC AppleHDA [Guide].pdf
It would be worth mentioning that a no codec situation may happen if proper IRQ fixes on DSDT are not applied.
I spent a lot of time trying to understand why sometimes CodecID was empty, and after some reboots / OS switches it was present (for a single boot).
After fixing IRQs as per common Laptop Patches, codec is always active and I was able to make audio work with little effort.

Thanks for the suggestion.