Error message is logged in the System log every time that you start Windows Vista: "ACPI BIOS does not contain an IRQ for the device in PCI slot <number>"

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SYMPTOMS

An error message that resembles the following may be logged in the System log every time that you start a Windows Vista-based computer:

Event Type: Error
Event Source: ACPI
Event Category: None
Event ID: 6
Date: Date
Time: Time
User: N/A
Computer: Computer_Name
Description:
IRQARB: ACPI BIOS does not contain an IRQ for the device in PCI slot number, function number. Please contact your system vendor for technical assistance.

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CAUSE

This error message may occur on a computer that uses a Peripheral Component Interconnect (PCI) bridge that supports message-signaled interrupts but does not support line-based interrupts.

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RESOLUTION

This error message may safely be ignored.

Note Do not ignore this error message if the following conditions are true:

A yellow explanation mark (!) appears next to the device in Device Manager.
You receive the following error message in the Properties dialog box for the device in Device Manager:
This device cannot find enough free resources that it can use. (Code 12)

In this scenario, a different issue may be causing the symptoms. Take additional steps to troubleshoot this issue.

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