-->
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 ACPI BIOS, the HAL causes Acpi.sys to be loaded during system startup at the base of the device tree. 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
AMI Power - Manage - Secure Home of BIOS & BMC Firmware. Download the latest drivers, firmware, and software for your HP Spectre x360 - 13-4013dx (ENERGY STAR).This is HP’s official website that will help automatically detect and download the correct drivers free of cost for your HP Computing and Printing products for Windows and Mac operating system.
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 ACPI Namespace Hierarchy.
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 Device Stacks for an ACPI Device.
A device for which Acpi.sys creates a device object is called an ACPI device. 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.
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. For more information, see Operation of an ACPI Device Function Driver.
An ACPI device is specified by a definition block in the system description tables 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 operation region handler 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 Supporting an Operation Region.
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.sys.
Ami Beso Driver Download For Windows Xp
To invoke a control method, the kernel-mode driver for an ACPI device initiates an IRP_MJ_DEVICE_CONTROL 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 Evaluating ACPI Control Methods.
ACPI specification
The Advanced Configuration and Power Interface Specification (ACPI 5.0 specification) is available from the Unified Extensible Firmware Interface Forum website.
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 connected standby power model. Starting with Windows 8 and later versions, the Windows ACPI driver, Acpi.sys, supports the new features in the ACPI 5.0 specification. For more information, see Windows ACPI design guide for SoC platforms.
ACPI debugging
System integrators and ACPI device driver developers can use the Microsoft AMLI debugger to debug AML code. Because AML is an interpreted language, AML debugging requires special software tools.
Ami Beso Driver Download For Windows 10
For more information about the AMLI debugger, see ACPI Debugging.
Microsoft ACPI source language (ASL) compiler
For information about compiling ACPI Source Language (ASL) into AML, see Microsoft ASL Compiler.
Version 5.0 of the Microsoft ASL compiler supports features in the ACPI 5.0 specification.
The ASL compiler is distributed with the Windows Driver Kit (WDK).
The ASL compiler (asl.exe) is located in the ToolsarmACPIVerify, Toolsarm64ACPIVerify, Toolsx86ACPIVerify, and Toolsx64ACPIVerify directories of the installed WDK, for example, C:Program Files (x86)Windows Kits10Toolsx86ACPIVerify.
Drivers are the most important component of a computer system and for that, you need free driver update software. They help the computer communicate to the hardware connected to the computer, like your video card, printer and some delicate components of the motherboard. Having proper drivers installed for your devices is very important for the proper functioning of a computer system as well as the hardware devices attached to the system. Also read Windows Update Error 0X80070057.
We often overlook them which may create various performance issues in the long run. Keeping drivers updated to the best free driver update software Windows helps you get the best performance out of your hardware. There are a few drivers that come built-in on your Windows computer, but many can only be accessed or updated directly from a hardware manufacturer’s site. Don’t miss reading webcam recording software.
Our recommendation is Auslogics Driver Updater
Here is a list of top free driver updater software for Windows 10/8/7 to update your drivers which will help your devices run smoothly and keep the computer system in top condition.
Free Driver Update Software for Windows
Table of Contents
1. Device Doctor
It is one of the best free driver update software that scans your computer and checks for the new updates of drivers for your devices. The drivers for every major PC hardware and device manufacturer can be found here. It also finds drivers in the Windows Device Manager for unidentified devices. It also offers a huge database of drivers. It gives you a one-click facility to detect your hardware and then it search in its large database for the latest drivers and immediately includes the correct drivers for your PC.
2. Double Driver
Double Driver is software to backup Windows Drivers. It is a very simple and useful tool which lets you check about drivers installed on your computer in detail and also helps you take backups, restore and save the chosen drivers. Double Driver helps you as some drivers are not easily available online and there are times when we don’t have the Driver CD and want to back up some important installed driver.
3. Snappy Driver Installer
Snappy Driver Installer is free driver updater software which will help you install missing drivers and update old drivers of your computer. It scans your computer and shows the up to date drivers as well as the duplicate and invalid drivers. It is the best application to use because it can work offline and you do not really need an internet connection to work. It will also let you know whenever a driver update is available.
4. Driver Fusion
It is a free driver updater for Windows 10 utility that manages and monitors your computer devices. It checks the health of your computer and finds the latest drivers automatically. It works as a complete device driver solution for your computer. It also enables you to delete the software and driver entries that were installed by a vendor installer. It allows you to view and restore the performed operations, helps you to backup and restore the position of the desktop icon and resolution of each screen and also offers other features such as Process Assist, Localisation, Vendor Support etc.
5. Driver Max
It is also device driver updater software that offers you an all in one solution to update the drivers of your computer. It helps you to restore and backup all the drivers of your PC. It provides a large online database of various drivers. It scans your computer, checks for the missing and outdated drivers and downloads them. After downloading it automatically installs those drivers on your PC. It includes an export wizard that lets you export all your current drivers to a folder or a compressed file.
6. Driver Booster
Driver Booster is one of the best driver updater software that updates the device drivers on your computer very easily. It has a large driver database that helps you find newly released drivers. It automatically scans your PC for outdated and missing drivers and updates your computer device drivers quickly and safely enhances your PC performance and game experience with up-to-date drivers. It helps you to find and install the correct drivers quickly with one click to avoid crashing your computer or causing devices to stop working. It also keeps a backup of the previous copy of drivers automatically.
Conclusion
These are some of the best free driver updater software that not only helps you to keep the device drivers up-to-date but also helps you to keep the functioning of the computer system in optimal condition. As the device drivers are important in the smooth functioning of the computer system, it is suggested to update the drivers regularly.
Some Other Useful Software