![]() The secondĪpproach requires the platform firmware to provide special methods that may be Specific value into one of its standard configuration registers. In what follows, the device power state is changed as a result of writing a In the firstĪpproach, that is referred to as the native PCI power management (native PCI PM) Or with the help of platform firmware, such as an ACPI BIOS. PCI devices may be put into low-power states in two ways, by using the deviceĬapabilities introduced by the PCI Bus Power Management Interface Specification, This may happen when there are some data for the device to handle orĪs a result of an external event requiring the device to be active, which may However, when it is necessary to use the device onceĪgain, it has to be put back into the "fully functional" state (full-power Usually, a device is put into a low-power state when it is underutilized orĬompletely inactive. Price of reduced functionality or performance. In general, power management is a feature allowing one to save energy by puttingĭevices into states in which they draw less power (low-power states) at the Native and Platform-Based Power Management ¶ Hardware and Platform Support for PCI Power Management ¶ 1.1. Runtime Power Management Framework for I/O Devices. Power management refer to Device Power Management Basics and For general description of the kernel's interfaces related to device ![]() This document only covers the aspects of power management specific to PCIĭevices. Based on previous work by Patrick Mochel Wysocki, Novell Inc.Īn overview of concepts and the Linux kernel's interfaces related to PCI power
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