http://channel9.msdn.com/wiki/default.aspx/CeDeveloper.BSPDriverPower
D0 - The device is on and running. It is receiving full power from the system and is delivering full functionality to the user.
D1 - The device is fully functional at a lower power or performance state than D0. D1 is applicable when the device is being used, but where peak performance is unnecessary and power is at a premium. A device driver can query the power level of the system using the function GetSystemPowerStatusEx2 .
D2 - The device is standing by, partially powered with automatic wakeup on request/activity.
D3 - The device is sleeping, partially powered with device-initiated wakeup if available on request/activity.
D4 - The device has no power.
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