Found in the Git master code for libdrm are several new files and modifications to existing files that provide some of the support needed to provide video mode-setting within the Direct Rendering Manager. Additionally, a few basic mode-setting tests were added to the libdrm code-base. This libdrm update is just one piece of the puzzle in obtaining kernel mode-setting support.
Kernel mode-setting support for Intel hardware is now primed and will be committed with the Linux 2.6.29 kernel while the KMS support for ATI hardware will likely appear in a later release. Likewise, the kernel mode-setting support for NVIDIA hardware through the Nouveau driver won't enter the mainline kernel anytime soon.