Ehh... you got something wrong there I think
So what you're seeing that fills your 16:10 display does not have 1:1 pixel ratio. I've often wondered about such things - do people not see the difference?? Or maybe there's something else at play here.
Actually, you'd think even multiples would work well, but they usually don't due to the scaling used in the chips. I'm talking about the most common chips; don't ask ME why they can't scale a x*y pic to 2x*2y pic with fidelity.
But anyway. Hope my previous post gave some insight about how the graphics were intended to be displayed.