Advanced Configuration and Power Interface (ACPI) is an open standard that operating systems can use to discover and configure computer hardware components, to perform power management (e.g. putting unused hardware components to sleep), auto configuration (e.g. Plug and Play and hot swapping), and status monitoring.

However, the system supports multiple power states that correspond to the power states defined in the Advanced Configuration and Power Interface (ACPI) specification. There are also variations of these states, such as hybrid sleep and fast startup. This article introduces these states and describes how they relate to each other.

2025年2月21日 · The integrated power management features supported by Microsoft Windows operating systems are available only on computers that have an Advanced Configuration and Power Interface (ACPI) BIOS. Windows only supports a computer with an ACPI-compliant BIOS that is dated January 1, 1999 or later.

ACPI classifies hardware into two categories: Fixed or Generic. Hardware that falls within the fixed category meets the programming and behavior specifications of ACPI. Hardware that falls within the generic category has a wide degree of flexibility in its implementation. 4.1. Hardware-Reduced ACPI ¶.

ACPI defines two cooling modes, Active and Passive: Passive cooling OS reduces the power consumption of devices at the cost of system performance to reduce the temperature of the system.

2023年4月6日 · Learn the differences between power operating modes, how they work, and what components are turned off or consume less power in each power state.

This document describes ACPI hardware interfaces, ACPI software interfaces and ACPI data structures that, when implemented, enable support for robust OS-directed configuration and power management (OSPM).

ACPI allows the operating system to control the amount of power each device is given (allowing it to put certain devices on standby or power-off for example). It is also used to control and/or check thermal zones (temperature sensors, fan speeds, etc), battery levels, PCI IRQ routing, CPUs, NUMA domains and many other things.

2024年4月24日 · ACPI, or Advanced Configuration and Power Interface, is an essential system-level interface and power management specification developed to unify and standardize the interaction between operating systems and hardware …

In ACPI there are six power states: S0, S1, S2, S3, S4, and S5. These states are defined as follows: the run state. In this state, the machine is fully running. the suspend state. In this state, the CPU will suspend activity but retain its contexts. sleep states. In these states, memory contexts are held but CPU contexts are lost.