The bios really won't be that different between vendors; if you ask any of them they will probably all tell you some variant of "you're on your own with Linux". The chipsets are the same and most of the bioses are just stock or slightly tweaked reference images from award or insyde, etc. The thing is, MS did not support APSM officially for a long time so most vendors never validated it since it wasn't a requirement for 90% of their markets. Various vendors implemented it directly in their drivers for specific devices and that's how we ended up where we are. It's not really realistic for vendors to go back and validate old hardware for a feature which was "unsupported" at the time. It's a waste of resources since there's no new revenue attached to it.



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