This is because those "open source drivers" as you call them include proprietary junk inside of them, as Magic Banana says.

For an example, check out all of the stuff that gets ripped out in order to make Linux-libre: http://linux-libre.fsfla.org/pub/linux-libre/releases/4.4-gnu/linux-libre-4.4-gnu.log

(And this is just the standard kernel from kernel.org - The one used by Ubuntu contains even more than this because they add even more proprietary junk in!)

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