The Windows ACPI driver, Acpi.sys, is an inbox component of the Windows operating system. The responsibilities of Acpi.sys include support for power management and Plug and Play (PnP) device enumeration. On hardware platforms that have an, the causes Acpi.sys to be loaded during system startup at the base of the. Acpi.sys acts as the interface between the operating system and the ACPI BIOS. Acpi.sys is transparent to the other drivers in the device tree.

Other tasks performed by Acpi.sys on a particular hardware platform might include reprogramming the resources for a COM port or enabling the USB controller for system wake-up. In this topic • • • • ACPI devices The hardware platform vendor specifies a hierarchy of ACPI namespaces in the ACPI BIOS to describe the hardware topology of the platform. For more information, see. For each device described in the ACPI namespace hierarchy, the Windows ACPI driver, Acpi.sys, creates either a filter device object (filter DO) or a physical device object (PDO). If the device is integrated into the system board, Acpi.sys creates a filter device object, representing an ACPI bus filter, and attaches it to the device stack immediately above the bus driver (PDO). For other devices described in the ACPI namespace but not on the system board, Acpi.sys creates the PDO.

Acpi.sys provides power management and PnP features to the device stack by means of these device objects. For more information, see. A device for which Acpi.sys creates a device object is called an.

The set of ACPI devices varies from one hardware platform to the next, and depends on the ACPI BIOS and the configuration of the motherboard. Note that Acpi.sys loads an ACPI bus filter only for a device that is described in the ACPI namespace and is permanently connected to the hardware platform (typically, this device is integrated into the core silicon or soldered to the system board). Not all motherboard devices have an ACPI bus filter. All ACPI functionality is transparent to higher-level drivers. These drivers must make no assumptions about the presence or absence of an ACPI filter in any given device stack. Digital Camera World June 2015 Pdf.

Acpi.sys and the ACPI BIOS support the basic functions of an ACPI device. To enhance the functionality of an ACPI device, the device vendor can supply a WDM function driver.

I just installed a fresh copy of windows 7 on my netbook (clean install). After installing all drivers, i looked at device manager and found one unknown device. Tried using unknown device identifier but did not identify the hardware. Unknown device instance path - ACPI CPL0002 2&DABA3FF&1. I cannot find any ACPI drivers to remove this unknown device problem in windows 7. The driver hardware id is cpl0002. Seems like a lot of people with y430 has this problem. Also the windows 7 beta driver list seems to only have drivers for thinkpads and not ideapads. Is it possible that this only happens.

For more information, see. An ACPI device is specified by a definition block in the in the ACPI BIOS. A device's definition block specifies, among other things, an operation region, which is a contiguous block of device memory that is used to access device data. Only Acpi.sys modifies the data in an operation region. The device's function driver can read the data in an operation region but must not modify the data.

When called, an transfers bytes in the operation region to and from the data buffer in Acpi.sys. The combined operation of the function driver and Acpi.sys is device-specific and is defined in the ACPI BIOS by the hardware vendor. In general, the function driver and Acpi.sys access particular areas in an operation region to perform device-specific operations and retrieve information. For more information, see.

ACPI control methods ACPI control methods are software objects that declare and define simple operations to query and configure ACPI devices. Control methods are stored in the ACPI BIOS and are encoded in a byte-code format called ACPI Machine Language (AML). The control methods for a device are loaded from the system firmware into the device's ACPI namespace in memory, and interpreted by the Windows ACPI driver, Acpi. Download Natiruts Acustico Rio De Janeiro 2012 here. sys. To invoke a control method, the kernel-mode driver for an ACPI device initiates an request, which is handled by Acpi.sys.

For drivers loaded on ACPI-enumerated devices, Acpi.sys always implements the physical device object (PDO) in the driver stack. For more information, see.

ACPI specification The Advanced Configuration and Power Interface Specification is available at the. Revision 5.0 of the ACPI specification introduces a set of features to support low-power, mobile PCs that are based on System on a Chip (SoC) integrated circuits and that implement the power model. Starting with Windows 8 and Windows 8.1, the Windows ACPI driver, Acpi.sys, supports the new features in the ACPI 5.0 specification.

For more information, see. ACPI debugging System integrators and ACPI device driver developers can use the Microsoft to debug AML code. Because AML is an interpreted language, AML debugging requires special software tools. Checked versions of the Windows ACPI driver, Acpi.sys, contain a debugger component to support AML debugging. For more information about the AMLI debugger, see. For information about how to download a checked build of Windows, see.

For information about compiling ACPI Source Language (ASL) into AML, see.