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Example System Power States (Windows Embedded CE 6.0)

1/6/2010

The following registry settings show a sample system-power-state-to-device-power-state mapping:

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power\State\On]
   "Default"=dword:0; D0
   "Flags"=dword:10000; POWER_STATE_ON
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power\State\UserIdle]
   "Default"=dword:1; D1
   "Flags"=dword:0
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power\State\SystemIdle]
   "Default"=dword:2; D2
   "Flags"=dword:0
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power\State\Suspend]
   "Default"=dword:3; D3
   "Flags"=dword:200000; POWER_STATE_SUSPEND; @CESYSGEN IF CE_MODULES_NDIS
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power\State\Suspend\{98C5250D-C29A-4985-AE5F-AFE5367E5006}]
   "Default"=dword:4; D4
; @CESYSGEN ENDIF CE_MODULES_NDIS

The following table shows the system power state and the device power state mapping according to the previous registry example.

System power state Device power state

On

D0

UserIdle

D1

SystemIdle

D2

Suspend

D3, except for Network Driver Interface Specification (NDIS) miniports, which are set to D4.

When the system enters the suspended state using this configuration, all possible wake sources are enabled, with the exception of NDIS miniports. If a device does not support D3, it automatically enters D4 instead.

Applications can create device power requirements by using the SetPowerRequirement function. You can create additional device power requirements by using Power Manager in Control Panel.

See Also

Reference

SetPowerRequirement

Concepts

System Power States