I'm not sure about XFree86, but the Xorg 'radeon' driver only recently received 2D acceleration for that GPU. My guess is that XFree86 still does not provide 2D acceleration since all major development seems to be in Xorg these days. It's possible that the Xorg available in pkgsrc will provide 2D acceleration (though Xorg via pkgsrc may not actually be up-to-date, too).
Adam
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