![]() When POWER IRPs request power state changes, the PCI driver writes to the PCI power management registers to set the hardware to different Dx states. For PCI-PM, the PCI driver is responsible for reading the PCI-PM registers to determine the capabilities of the hardware. In general, the responsibilities for device drivers are as follows:īus drivers: Bus drivers are responsible for enumerating, configuring, and controlling devices. This discussion assumes that you are familiar with how Windows Driver Model (WDM) drivers handle power management events, as described in the current Windows DDK. For more information, see Device drivers and PCI power management ![]() This article clarifies some confusion that vendors have experienced about how hardware that complies with PCI Power Management (PCI-PM) interacts with device drivers in the operating system and about how PCI-PM integrates with ACPI.
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