https://bugs.freedesktop.org/show_bug.cgi?id=29726
--- Comment #8 from James Le Cuirot chewi@aura-online.co.uk 2010-10-25 02:11:15 PDT --- (In reply to comment #7)
I quite like vsyncing so I'm a little sad if it's broken. I think it was working before?
It wasn't supported before. KMS vsync support was added with the commit cited in this bug.
It's been so long since I had a driver with working vsync that I've forgotten what it looks like. ;)