Hi guys!
Sorry to resurrect the old thread, but have you found the solution for this?
I fixed the aggravating intermediate screen tearing problem by switching from fkms to kms, but now I'm having those errors... I know they're not that big of a deal, but they really poke my eyes.
...I had massive tearing even with Vsync ON and double buffering - and I don't like tripple buffering because of input delay.
Switching from fkms to kms fixed it and all the games are much more responsive right now!