# echo dynpm > /sys/class/drm/card0/device/power_methodWith profile method you can select from several profiles: default, auto, low, mid and high. Default settings is the default profile. It uses default clocks and doesn't change power states. The low, mid, high profiles change the GPU clocks accordingly. The auto profile switches automatically between high and mid depending whether the system is running on AC or battery. It also switches to low when the monitors are in dpms off. Not all cards supports all profiles. For example to activate the auto profile, use:
# echo profile > /sys/class/drm/card0/device/power_method # echo auto > /sys/class/drm/card0/device/power_profileMore details can be found on http://www.x.org/wiki/RadeonFeature.
We also added experimental support for this to tuned. We activate the power savings in desktop and laptop profiles. The code is currently in tuned git.
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