I stumbled upon this bug while testing and debugging a game using the st/nine. And I made a tentative fix that works for me. (caveat: I know nothing about mesa/gallium/graphic cards, but hey..) Here is the proposed patch: https://github.com/xxxbxxx/Mesa-3D/commit/0722d721f8e5ec496bf8ce4591a3b8a5bf87745d or attached.