Industry Initiatives for Power Management
The OnNow initiative defines hardware and software support required for power management.
The Advanced Configuration and Power Interface Specification, part of the OnNow initiative, defines a hardware-level interface that enables operating systems to implement power management in a consistent, platform-independent way.
A Device Class Power Management Reference Specification is available for each common device class, such as audio or communications devices. Each of these specifications defines power management requirements for a class of device. Driver writers should refer to these specifications, available through the ACPI / Power Management website, for device-specific details.