https://bugs.freedesktop.org/show_bug.cgi?id=56865
--- Comment #9 from Michel Dänzer michel@daenzer.net --- (In reply to comment #8)
MLAA worked for me in 8.0 and it seems to be a regression in 9.0.
Comment #7 explained that MLAA may not actually have been enabled with 8.0.
(How) Did you verify that it was?