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acpi.sys BSOD and high CPU usage

May 20, 2014

DLL ToolDLL TOOL downloads and replaces corrupt acpi.sys driver to repair acpi.sys blue screen of death BSOD and high CPU usage problems for PCs installed with Microsoft Windows 8.1/8/7/XP/Vista OS, both 32 and 64 bits.




What is acpi.sys?

ACPI stands for Advanced Configuration and Power Interface. The Windows ACPI driver, Acpi.sys, is an inbox component of the Windows operating system. ACPI.sys is located in the folder C:\Windows\System32\drivers. The driver can be started or stopped from Services in the Control Panel or by other programs. It is an invisible Windows system file.

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.

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.

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.

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.

The Advanced Configuration and Power Interface Specification is available at the ACPI 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 Windows 8.1, the Windows ACPI driver, Acpi.sys, supports the new features in the ACPI 5.0 specification.

Signs of acpi.sys errors

  1. ACPI driver is causing auto-reboot.
  2. Error Code: \Windows\system32\driver\acpi.sys after installing updates. Now computer is stuck in a reboot loop.
  3. Acpi.sys stop:0x000000BE.
  4. STOP 0x0000009f caused by ACPI.SYS when going into standby.
  5. Acpi.sys corrupted on boot up disk windows on black screen.
  6. Unable to shut down errors with acpi.sys ksetdd.sys.
  7. DRIVER_IRQL_NOT_LESS_OR_EQUAL STOP: 0x000000d1 ACPI.SYS ADRESS F7394E3A base at F738A000.
  8. Windows 8.1 Blue screen ACPI BIOS ERROR.
  9. Clean install of Win 7 fails with ACPI.sys and bluescreen stop error: 0x0000007E.
  10. ACPI_ERR_AMLI_ILLEGAL_IO_READ_FATAL.
  11. Missing Driver: ACPI\TOS6208\2&DABA3FF&1 Error Code 28.
  12. Error Message - Can't Open ACPI Kernel Mode Drive.
  13. Stop error 0x000000A5 Bios not fully ACPI compliant.
  14. DRIVER_POWER_STATE_FAILURE -- 0x9f -- ntoskrnl.exe+ACPI.sys.
  15. ACPI -Compliant Control Method Battery driver fails after initial Windows 8 update.

Why do you have acpi.sys errors?

Some common causes of this error are listed as follows:

  1. Registry files are corrupted or damaged;
  2. Boot sector is corrupted;
  3. Faulty hardware or software or driver is installed;
  4. File system is missing;
  5. There are virus attacks, adware or spyware infection;
  6. Improper maintenance or incomplete installation may also cause some Acpi.sys error code.

And all these causes are rooted in their specific registry codes, because Registry is the most critical component of Windows that stores every data and configuration of your computer, every hardware/software needs to connect to registry to function properly. However, the everyday regular use of computer will keep creating wasted/invalid/obsolete entries that could bloat the registry and cause registry malfunction eventually, this could lead to system slowness and windows freezing.

What is worse, the corrupted registry entries due to improper operation and malware infection could result in various system errors including the acpi.sys error. At the moment Acpi.sys error occurs, you may face critical problem in your computer like acpi.sys bsod, so you need to repair the registry as soon as possible.

Solutions to acpi.sys errors

1. Perform a System restore

If Acpi.sys error messages appear on the screen, use the System Restore tool to restore your computer to an earlier time before the problems began. A system restore is one of the safest ways to solve problems. If the problems persist, use the Windows CD to repair your operating system. To repair the system, insert the CD into the drive, and then boot from the disc. When prompted, select the repair option and follow the guided prompts to repair your operating system.

2. Run a full scan of your computer system

It's found that rogue or fake software often generate fake error messages on the computer to mislead computer users into purchasing their useless programs. If the System Restore can not fix your error, it's necessary for you to check up your system for malware with DLL TOOL, which has detailed approaches to remove the infection related to dll errors.

It is very hard to fix Acpi.sys error manually, because this will involve the registry keys of many other dll files to be fixed, and it is difficult to find the exactly place of these issues. Therefore, it is recommended to use DLL TOOL to help you. This repair software is able to exactly analyze the faulty registry keys with its powerful algorithm and renew them to the normal state; you will have a healthy acpi.sys running for your system.

DLL TOOL is also designed to fix all stop errors, high cpu/memory, driver and update issues. Acpi.sys isn't installed by a specific program, so downloading a copy of Acpi.sys when it is missing. DLL TOOL will help with a reliable and complete collection of system files including Acpi.sys for free download.