https://bugs.freedesktop.org/show_bug.cgi?id=49309
--- Comment #4 from Alex Deucher agd5f@yahoo.com 2012-04-30 16:34:16 PDT --- GL3 requires MSAA which is not yet supported. GL3 was mistakenly enabled without it initially. Dave has a branch with initial support which will be merged when ready: http://cgit.freedesktop.org/~airlied/mesa/log/?h=r600g-ms