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Note that neither radeon nor radeonhd have much to do with 3D -- that is all implemented in the mesa and drm drivers. The X drivers (radeon and radeonhd) just handle modesetting and 2D acceleration. They can either do 2D acceleration themselves or run over drm - but if you want 3D then the 2D acceleration needs to go through drm as well.
You need (radeon or radeonhd) plus mesa plus drm to get a full accelerated driver stack.