Created attachment 71997 [details]
Screenshot of the broken menu.

This is on newest mesa from git with kernel 3.8-rc1 (+ this patch:
http://cgit.freedesktop.org/~agd5f/linux/commit/?h=drm-fixes-3.8&id=668bbc81baf0f34df832d8aca5c7d5e19a493c68
)

When the Mojang loading screen should stop and the menu should be rendered all
that happens is that the menus background is rendered in one edge, see
attachment.