Comment 63 for bug 748080

Better power management for AMD/ATI Radeon R600 and newer hardware is finally available in the upstream 3.11 linux kernel.

For people using Ubuntu, the first release candidate (3.11-rc1) of the 3.11 kernel is available at http://kernel.ubuntu.com/~kernel-ppa/mainline/ and instructions on how to install and uninstall it are available at https://wiki.ubuntu.com/Kernel/MainlineBuilds

Fedora users can get the 3.11-rc1 kernel from Rawhide at http://mirrors.fedoraproject.org/publiclist/Fedora/development/
For more information about using Rawhide, see https://fedoraproject.org/wiki/Releases/Rawhide?rd=Rawhide

Users of other Linux distributions will need to obtain the 3.11 kernel by other means.

For now, to use this power management for the AMD/ATI Radeon you will need to select it at boot by adding radeon.dpm=1 to your GRUB kernel boot options as described at https://help.ubuntu.com/community/Grub2/Troubleshooting#Editing_the_GRUB_2_Menu_During_Boot