Ars Technica article

[Grzegorz Junka]

> Oh, I'm not blaming him at all.  And more to it, while Andrea Venturoli
> is currently helps to debug xf86-video-ati-legacy issues, I'm not that
> concerned about that driver, but rather that all other DRM ports except
> legacy locking up my laptop upon "kldload radeonkms".  This isn't right;
> it should be debugged and fixed, and only then drm-legacy-kmod port can
> be removed.
>

For what's is worth, since I moved from 12.0 to 12.1 none of the new DRM 
ports worked for me. The only working configuration was kernel/world 
from CURRENT (13) and ports compiled at least on 12.1-RELEASE. Are you 
trying binary distributions or compiling on your own?

--GrzegorzJ