Книга: Microsoft Windows Embedded CE 6.0 Exam Preparation Kit

Overriding the Power State Configuration for Device Classes

Overriding the Power State Configuration for Device Classes

Defining device power state for multiple system power states individually can be a tedious task. Power Manager facilitates the configuration by supporting device classes based on IClass values, which can be used to define the power management rules. The following three default class definitions are found under the HKEY_LOCAL_MACHINESystemCurrentControlSetControlPowerInterfaces registry key.

? {A3292B7-920C-486b-B0E6-92A702A99B35} Generic power management-enabled devices.

? {8DD679CE-8AB4-43c8-A14A-EA4963FAA715} Power-management-enabled block devices.

? {98C5250D-C29A-4985-AE5F-AFE5367E5006} Power-management-enabled Network Driver Interface Specification (NDIS) miniport drivers.

Table 3-20 shows a sample configuration for the NDIS device class, which specifies that NDIS drivers only go as high as the D4 state.

Table 3-20 Sample power state definition for NDIS device class

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