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Lenovo still puts it back on some of the laptops, like the X1 Carbon 9th Gen. So, I suppose this is not strictly dependent on the CPU.

After looking for confirmation of this, S3 support seems to be either missing or broken in various ways, there'a a reddit thread where a System76 engineer talks about the mess that was: https://old.reddit.com/r/System76/comments/k7xrtz/ill_have_w...