> This is new territory for me, so forgive me if this is a goofy question, but 
> how are these dmic dependent gain parameters 
> typically provided? Is this something that should be provided in, say, the 
> ACPI tables, or is this typically hard-coded in the drivers? 
> How is this handled in the Windows world?

Given my limited knowledge, so take this with a grain of salt: I'd say
that the most common is that BIOS sets this up somehow, if there's
something that needs to be configured, because this makes WHQL Testing
easier. But it is not uncommon for the windows 3rd party drivers
(provided by Via, Realtek, Conexant etc) to mess around with these
things as well.

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https://bugs.launchpad.net/bugs/1227148

Title:
  System76 galu1: Inverted Internal microphone (phase inversion)

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