Configure System Power States (Compact 7)
3/12/2014
Each system power state maps to a set of device power states that define power levels for the devices on your platform. You define this mapping in the registry by creating a registry key for each system power state. Under each system power state registry key, you create registry values to assign a power level for each of the devices in the system. In some cases, a given system power state maps all devices to the same device power state.
For example, when your platform is running on AC power, all devices on the platform may have a device power state of D0 (Full On). Other system power states may define different power states for different devices. For example, if your platform is running on battery power, you may choose to run the display and the CPU at device power state D1 (Low On) while the network device sleeps at device power state D3. You might define system power states so that certain devices are turned off if the unit is not in a cradle, or allow devices to run at a high power consumption level if the device is plugged into AC power.