I went ahead and merged the Radeon R6/7xx code to -STABLE a while ago. The current xorg drivers will not enable it by default on R600+ chips. You will need to be using xf86-video-ati-6.12.0, xf86-video-radeonhd-devel or possibly even better git master of either.
You will need to add the following to the Device section of your xorg.conf to enable it. If you are experiencing issues, commenting these two options out, will prevent Xorg from auto-loading the kernel module. Options "DRI" Options "AccelMethod" "EXA" robert. -- Robert Noland <rnol...@freebsd.org> FreeBSD
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