Since Linux Kernel 3.11, the open source AMD Radeon driver got dynamic power management (DPM) feature support. If you have already installed the Kernel 3.11 or higher and have a Radeon HD 2000 (R600) series or newer graphics card, you may wish to enable DPM feature by below steps (DRM will probably be enabled… Continue reading Enable Radeon Dynamic Power Management in Ubuntu 12.04/13.10