Volume and brightness slider not working

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20

I have just done a websearch for "Cirrus Logic CS4208 sound output Ubuntu 21"

Found this:
https://bugzilla.kernel.org/show_bug.cgi?id=203613

EDIT: Also this:

But I also have a nagging memory of other Mac/Cirrus Logic CS4208 sound output problems posted in the past. I will try and find.

EDIT: Found them, but bad news is nothing we suggested worked at the time and so suggested Z16 which was Beta at that time. If you want to read:

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