[Hampshire] Motherboards supporting s2ram

I'm not sure if there's an easy answer to this one, but I'm looking for a
motherboard that supports s2ram. Any advice as to how I could find one?
There doesn't seem to be a list of such motherboards anywhere (that I
could find). There are, of course, more requirements than just supporting
s2ram, so I can post a full list of requirements if that's helpful.

Keith