How to Enable ACPI Support in Windows 98

ID: Q195218

The information in this article applies to:
IMPORTANT: This article contains information about editing the registry. Before you edit the registry, make sure you understand how to restore it if a problem occurs. For information about how to do this, view the "Restoring the Registry" Help topic in Regedit.exe or the "Restoring a Registry Key" Help topic in Regedt32.exe.

SUMMARY

This article describes how to enable Advanced Configuration and Power Interface (ACPI) support in Windows 98.


MORE INFORMATION

WARNING: Using Registry Editor incorrectly can cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk.

For information about how to edit the registry, view the "Changing Keys And Values" Help topic in Registry Editor (Regedit.exe) or the "Add and Delete Information in the Registry" and "Edit Registry Data" Help topics in Regedt32.exe. Note that you should back up the registry before you edit it.

NOTE: To enable ACPI support in Windows 98, you must have an ACPI- compatible motherboard and an ACPI 1.0-compliant Basic Input/Output System (BIOS).

To enable ACPI support in Windows 98, use either of the following methods:


Method 1

Reinstall Windows 98 using the "/p j" command-line switch. This adds the ACPIOption string value with a value data of 1 to the registry. To run Windows 98 Setup using the "/p j" command-line switch, click Start, click Run, type the following command in the Open box, and then click OK: 


   setup /p j


Reinstalling Windows 98 is the best way to ensure that all devices are configured correctly.


Method 2

Force ACPI detection by manually adding the ACPIOption string value to the registry, and then use the Add New Hardware tool in Control Panel to redetect your computer's hardware. To do so, follow these steps:

  1. Since your CD-ROM drive is disabled by the Plug and Play BIOS during hardware detection, manually copy the Windows 98 cabinet (.cab) files from the Windows 98 CD-ROM to your hard disk. To do so, follow these steps:

    1. Create a new folder on your hard disk (such as Win98temp). For information about how to create a folder, click Start, click Help, click the Index tab, type "folders" (without quotation marks), and then double-click the "To Create A Folder" topic.


    2. Copy the contents of the Win98 folder on the Windows 98 CD-ROM to the folder you created in step A. For information about how to copy files and folders, click Start, click Help, click the Index tab, type "copying" (without quotation marks), and then double-click the "Copying Files, Folders" or "Files Or Folders" topic.




  2. Using Registry Editor, add the "ACPIOption" (without quotation marks) string value with a value data of 1 to the following registry key:

    HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\Current Version\Detect


  3. Quit Registry Editor.


  4. Click Start, point to Settings, click Control Panel, and then double- click Add New Hardware.


  5. Click Next, click Next again, click Yes (Recommended), and then click Next. ACPI should be detected and installed. After your computer is restarted, all ACPI-enumerated devices are set up again.

    NOTE: If you are prompted for files that the Add New Hardware Wizard cannot find, click Cancel or click Browse and locate the folder to which you copied the Windows 98 .cab files. Do not click Skip File, as this can cause Windows 98 to stop responding (hang) when you restart your computer and require you to reinstall Windows 98.


If there are duplicate entries in Device Manager after enabling ACPI, click a duplicate device that is not showing a conflict, and then click Remove.

For example, if two video adapters are listed, one has a resource conflict indicated by an exclamation point in a yellow circle next to the device. Remove the working video adapter and restart your computer. The device with the resource conflict is the one that should now be running in ACPI mode.

NOTE: After using method 2 to enable ACPI support, some devices may still detect a conflicting counterpart even after you remove them. If the device is working correctly, use method 1 to reinstall Windows 98 using the "/p j" command-line switch.

Additional query words: APM advanced power management 


Keywords          : kbenv kbhw win98 
Version           : WINDOWS:98
Platform          : WINDOWS 
Issue type        : kbhowto

Last Reviewed: January 30, 1999