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PowerWriteACDefaultIndex function (powrprof.h)

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Sets the default AC index of the specified power setting.

Syntax

DWORD PowerWriteACDefaultIndex(
  [in, optional] HKEY       RootSystemPowerKey,
  [in]           const GUID *SchemePersonalityGuid,
  [in, optional] const GUID *SubGroupOfPowerSettingsGuid,
  [in]           const GUID *PowerSettingGuid,
  [in]           DWORD      DefaultAcIndex
);

Parameters

[in, optional] RootSystemPowerKey

This parameter is reserved for future use and must be set to NULL.

[in] SchemePersonalityGuid

The identifier of the scheme personality for this power setting. A power setting can have different default values depending on the power scheme personality.

[in, optional] SubGroupOfPowerSettingsGuid

The subgroup of power settings. This parameter can be one of the following values defined in WinNT.h. Use NO_SUBGROUP_GUID to refer to the default power scheme.

Value Meaning
NO_SUBGROUP_GUID
fea3413e-7e05-4911-9a71-700331f1c294
 Settings in this subgroup are part of the default power scheme.
GUID_DISK_SUBGROUP
0012ee47-9041-4b5d-9b77-535fba8b1442
 Settings in this subgroup control power management configuration of the system's hard disk drives.
GUID_SYSTEM_BUTTON_SUBGROUP
4f971e89-eebd-4455-a8de-9e59040e7347
 Settings in this subgroup control configuration of the system power buttons.
GUID_PROCESSOR_SETTINGS_SUBGROUP
54533251-82be-4824-96c1-47b60b740d00
 Settings in this subgroup control configuration of processor power management features.
GUID_VIDEO_SUBGROUP
7516b95f-f776-4464-8c53-06167f40cc99
 Settings in this subgroup control configuration of the video power management features.
GUID_BATTERY_SUBGROUP
e73a048d-bf27-4f12-9731-8b2076e8891f
 Settings in this subgroup control battery alarm trip points and actions.
GUID_SLEEP_SUBGROUP
238C9FA8-0AAD-41ED-83F4-97BE242C8F20
 Settings in this subgroup control system sleep settings.
GUID_PCIEXPRESS_SETTINGS_SUBGROUP
501a4d13-42af-4429-9fd1-a8218c268e20
 Settings in this subgroup control PCI Express settings.

[in] PowerSettingGuid

The identifier of the power setting.

[in] DefaultAcIndex

The default AC index.

Return value

Returns ERROR_SUCCESS (zero) if the call was successful, and a nonzero value if the call failed.

Remarks

Changes to the settings for the active power scheme do not take effect until you call the PowerSetActiveScheme function.

Requirements

Requirement Value
Minimum supported client Windows Vista [desktop apps only]
Minimum supported server Windows Server 2008 [desktop apps only]
Target Platform Windows
Header powrprof.h
Library PowrProf.lib
DLL PowrProf.dll

See also

Power Management Functions