https://bugs.freedesktop.org/show_bug.cgi?id=27069
--- Comment #8 from Alex Deucher agd5f@yahoo.com 2011-09-02 06:49:43 PDT --- UMS supported Colortiling and hyperZ on r1xx/r2xx asics and a few other features that haven't been implemented with KMS yet. The information is available if someone wants to add support to KMS. KMS also defaults to vsynced 3D. r3xx and newer asics should be faster with KMS.