Have you tried enabling DPM [1]? This feature was added in 3.11, but it's not enabled by default. You need to set a kernel parameter to make it work (radeon.dpm

Have you tried enabling DPM [1]? This feature was added in 3.11, but it's not enabled by default. You need to set a kernel parameter to make it work (radeon.dpm=1 in your grub config). [1] https://wiki.archlinux.org/index.php/ATI#Dynamic_power_management https://wiki.archlinux.org/index.php/ATI#Dynamic_power_manag...