Power Management

1. MS 관련 자료
http://msdn.microsoft.com/en-us/library/aa373239(VS.85).aspx

http://msdn.microsoft.com/en-us/library/aa373239(VS.85).aspx

USER_POWER_POLICY Structure

 C++

typedef struct _USER_POWER_POLICY {
  ULONG               Revision;
  POWER_ACTION_POLICY IdleAc;
  POWER_ACTION_POLICY IdleDc;
  ULONG               IdleTimeoutAc;
  ULONG               IdleTimeoutDc;
  UCHAR               IdleSensitivityAc;
  UCHAR               IdleSensitivityDc;
  UCHAR               ThrottlePolicyAc;
  UCHAR               ThrottlePolicyDc;
  SYSTEM_POWER_STATE  MaxSleepAc;
  SYSTEM_POWER_STATE  MaxSleepDc;
  ULONG               Reserved[2];
  ULONG               VideoTimeoutAc;
  ULONG               VideoTimeoutDc;
  ULONG               SpindownTimeoutAc;
  ULONG               SpindownTimeoutDc;
  BOOLEAN             OptimizeForPowerAc;
  BOOLEAN             OptimizeForPowerDc;
  UCHAR               FanThrottleToleranceAc;
  UCHAR               FanThrottleToleranceDc;
  UCHAR               ForcedThrottleAc;
  UCHAR               ForcedThrottleDc;
}USER_POWER_POLICY, *PUSER_POWER_POLICY;

Members

Revision

The current structure revision level. Set this value by calling GetCurrentPowerPolicies or ReadPwrScheme before using a USER_POWER_POLICY structure to set power policy.

IdleAc

A POWER_ACTION_POLICY structure that defines the system power action to initiate when the system is running on AC (utility) power and the system idle timer expires.

IdleDc

A POWER_ACTION_POLICY structure that defines the system power action to initiate when the system is running on battery power and the system idle timer expires.

IdleTimeoutAc

The time that the level of system activity must remain below the idle detection threshold before the system idle timer expires when running on AC (utility) power, in seconds.

This member is ignored if the system is performing an automated resume because there is no user present. To temporarily keep the system running while an application is performing a task, use the SetThreadExecutionState function.

IdleTimeoutDc

The time that the level of system activity must remain below the idle detection threshold before the system idle timer expires when running on battery power, in seconds.

This member is ignored if the system is performing an automated resume because there is no user present. To temporarily keep the system running while an application is performing a task, use the SetThreadExecutionState function.

IdleSensitivityAc

The level of system activity that defines the threshold for idle detection when the system is running on AC (utility) power, expressed as a percentage.

IdleSensitivityDc

The level of system activity that defines the threshold for idle detection when the system is running on battery power, expressed as a percentage.

ThrottlePolicyAc

The processor dynamic throttling policy to use when the system is running on AC (utility) power.

ThrottlePolicyDc

The processor dynamic throttling policy to use when the system is running on battery power.

MaxSleepAc

The maximum system sleep state when the system is running on AC (utility) power. This member must be one of the SYSTEM_POWER_STATE enumeration type values.

MaxSleepDc

The maximum system sleep state when the system is running on battery power. This member must be one of the SYSTEM_POWER_STATE enumeration type values.

Reserved

Reserved.

VideoTimeoutAc

The time before the display is turned off when the system is running on AC (utility) power, in seconds.

VideoTimeoutDc

The time before the display is turned off when the system is running on battery power, in seconds.

SpindownTimeoutAc

The time before power to fixed disk drives is turned off when the system is running on AC (utility) power, in seconds.

SpindownTimeoutDc

The time before power to fixed disk drives is turned off when the system is running on battery power, in seconds.

OptimizeForPowerAc

If this member is TRUE, the system will turn on cooling fans and run the processor at full speed when passive cooling is specified and the system is running on AC (utility) power. This causes the operating system to be biased towards using the fan and running the processor at full speed.

OptimizeForPowerDc

If this member is TRUE, the system will turn on cooling fans and run the processor at full speed when passive cooling is specified and the system is running on battery power. This causes the operating system to be biased towards using the fan and running the processor at full speed.

FanThrottleToleranceAc

The lower limit that the processor may be throttled down to prior to turning on system fans in response to a thermal event while the system is operating on AC (utility) power, expressed as a percentage.

FanThrottleToleranceDc

The lower limit that the processor may be throttled down to prior to turning on system fans in response to a thermal event while the system is operating on battery power, expressed as a percentage.

ForcedThrottleAc

The processor throttle level to be imposed by the system while the computer is running on AC (utility) power, expressed as a percentage.

ForcedThrottleDc

The processor throttle level to be imposed by the system while the computer is running on battery power, expressed as a percentage.

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