Comment # 23 on bug 99418 from Michel Dänzer

(In reply to lei.pero from comment #22)
> Ok, I've built mesa with that parameter changed and installed, same
> behavior. I've cloned just "git://anongit.freedesktop.org/git/mesa/mesa" ,
> it should be enough.

Did you verify that it's hitting the path you modified? E.g. if chromium is
fullscreen and there's no compositor, it may hit the if case instead of the
else case. Maybe try changing the if case to 2 buffers as well.