(In reply to Peter Wu from comment #16)
> Ok, do you have any certainty about the earliest BIOS date where _PR3 is
> used? E.g. if the minimum date is lowered to 2014 without checking for _PR3,
> would it be likely to miss out some models?

It's always used if it's available.  I think 2014 should be ok (should catch
most of the early ones), but I'll check with our windows architects.  I suspect
it will come down to OEM/ODMs.