For those DragonFlyBSD desktop users, in the latest development kernel the DRM graphics driver code was just pulled in sync with FreeBSD.
DragonFlyBSD has synced their DRM code with FreeBSD as has been done in the past. Among the latest work gained by updating against the latest FreeBSD code as of the beginning of the month is the necessary groundwork for the Radeon KMS driver, support for E-DDC, updated atomic routines for maintaining compatibility with the Linux APIs and runtime behavior, and other improvements as of the Linux 3.8-rc3 kernel for which the FreeBSD DRM code is largely based.
At the end of August the Radeon DRM/KMS driver was merged into FreeBSD
but that new driver isn't part of this DragonFlyBSD pull, just the necessary infrastructure updates for handling the driver that will ultimately be on DragonFlyBSD.
More details on the updated DragonFlyBSD DRM code can be found from this Git commit