Upvoting because I'm also curious about this...

As far as I'm aware, S3 and SOix both exist on AMD, but I'm not sure whether they can exist simultaneously. There seems to be just as much confused annoyance at power consumption issues on AMD laptops as with Intel, e.g. https://forums.lenovo.com/t5/Other-Linux-Discussions/P14s-Ge...

Not really sure what to make of that, but it sure is disheartening.

Separately, while AMD's better performance / watt would seem to make it a good candidate for laptops, lack of Thunderbolt across the board has also been frustrating, especially if you already have a nice TB dock setup.