https://bugs.freedesktop.org/show_bug.cgi?id=62889
--- Comment #7 from Michel Dänzer michel@daenzer.net --- This is why ColorTiling is still disabled by default for your card... just leave it at that? :)
(In reply to comment #5)
If I disable ColorTiling, Gnome doesn't load completely only showing the desktop wallpaper Errors about unable to find displaybuffer (or something like that... not sure of exact error)
Sounds like a separate issue. FWIW, 'unable to find displaybuffer' sounds like something I've seen myself, though AFAIR without ill effect.