Hi Whir,
Simply put, "you can't".. you have to change the the ACPI PC in device manager (which is the default) to Standard PC .. that will allow you to change IRQ settings ...
I think this will explain what you wanna know
Quote:
Unable to Change a Resource Setting (assign irq) in Device Manager
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The information in this article applies to:
Microsoft Windows XP Home Edition
Microsoft Windows XP Professional
Microsoft Windows 2000 Professional
Microsoft Windows 2000 Advanced Server
Microsoft Windows 2000 Server
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SYMPTOMS
On a computer that is running the Windows Advanced Configuration and Power Interface (ACPI) Hardware Abstraction Layer (HAL), you may not be able to change a resource setting for a device in Device Manager. If you modify the resource settings in the BIOS, the changes may not register.
CAUSE
The ACPI HAL controls resource assignments in Windows and does not permit user intervention.
STATUS This behavior is by design.
MORE INFORMATION
Microsoft does not recommend that you change the HAL that is installed during the Windows Setup process. When you change from the ACPI HAL to the Standard PC HAL, you must reinstall the operating system. ACPI functionality is then lost. In some rare instances, you may need to have control over a resource assignment. You are only able to manually configure resources in Windows when the Standard PC HAL is used, and even then you may not be able to configure the device. The device must support the ability to manually set the resources.
For additional information, click the article number below to view the article in the Microsoft Knowledge Base:
In english go to device manager
-click on the + in front of computer
-right click the advanced configuration and power interface
-click properties
-driver tab
-update
-install from list
-choose specific
-standard pc
That will enable you to change irqs
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Regards