The radeonhd driver, or xf86-video-radeonhd is an X.org video driver for R500 and newer ATI graphics devices.
It is being developed by Novell for AMD, with the free documentation provided by AMD.
The driver supports full modesetting (read: any mode is usable, not only those provided by the BIOS), which is backwards compatible to RandR 1.2. Future work is happening especially on more advanced features like 2D, 3D and video acceleration.
These details are provided for information only. No information here is legal advice and should not be used as such.