Error Message: ACPI BIOS Is Attempting to Write to an Illegal IO Port Address (0x80, 0x400, 0xcf8, 0xcfc)

View products that this article applies to.

This article was previously published under Q317513

For a Microsoft Windows XP version of this article, see 283649 (http://support.microsoft.com/kb/283649/EN-US/ ) .

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SYMPTOMS

You may receive one or more of the following error events in the Event Viewer:

Source: ACPI
Category: None
Type: Error
Event ID: 12
User: N/A
Computer: Machine_Name
Description: AMLI: ACPI BIOS is attempting to create an illegal memory OpRegion, starting at address 0x400, with a length of 0x100. This region lies in the Operating system's protected memory address range (0x0 - 0x9fc00). This could lead to system instability. Please contact your system vendor for technical assistance.

For more information, For more information, see Help and Support Center at: http://support.microsoft.com (http://support.microsoft.com/)

Source: ACPI
Category: None
Type: Error
Event ID: 5
User: N/A
Computer: Machine_Name
Description: AMLI: ACPI BIOS is attempting to write to an illegal IO port address (0xcf8), which lies in the 0xcf8 - 0xcff protected address range. This could lead to system instability. Please contact your system vendor for technical assistance.

For more information, see Help and Support Center at:
http://support.microsoft.com (http://support.microsoft.com/)

Source: ACPI
Category: None
Type: Error
Event ID: 4
User: N/A
Computer: Thunderbird
Description: AMLI: ACPI BIOS is attempting to read from an illegal IO port address (0xcfc), which lies in the 0xcf8 - 0xcff protected address range. This could lead to system instability. Please contact your system vendor for technical assistance.

For more information, see Help and Support Center at:
http://support.microsoft.com (http://support.microsoft.com/)

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CAUSE

This behavior may occur if your computer's basic input/output system (BIOS) tries to write to a port in ACPI Machine Language (AML). This attempt causes Windows Server 2003 to prevent all access to that port.

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RESOLUTION

To resolve this issue, contact your computer manufacturer or the BIOS vendor for possible updates to your computer BIOS.

For information about how to contact your computer hardware manufacturer, click the appropriate article number in the following list to view the article in the Microsoft Knowledge Base:

65416 (http://support.microsoft.com/kb/65416/EN-US/ ) Hardware and Software Third-Party Vendor Contact List, A-K

60781 (http://support.microsoft.com/kb/60781/EN-US/ ) Hardware and Software Third-Party Vendor Contact List, L-P

60782 (http://support.microsoft.com/kb/60782/EN-US/ ) Hardware and Software Third-Party Vendor Contact List, Q-Z

Microsoft provides third-party contact information to help you find technical support. This contact information may change without notice. Microsoft does not guarantee the accuracy of this third-party contact information.

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