>Johan:  Glad to help out.  WinXP handles IRQs differently, as you found out:
>
>It is normal behavior for PCI devices to have IRQs shared among them, especially 
>on Advanced Configuration and Power Interface (ACPI) computers that have Windows 
>ACPI support enabled. 
>
>In Windows XP, Device Manager may list some or all of the devices on your ACPI motherboard 
>as using the same IRQ (IRQ 9). (To view the list of resources, click either Resources 
>by type or Resources by connection on the View menu). No option is available to 
change 
>the IRQ setting.
> 
>Windows takes advantage of the ACPI features of the motherboard, including advanced 
>PCI sharing. The PCI bus uses IRQ 9 for IRQ steering. This feature lets you add 
more 
>devices without generating IRQ conflicts. 
>
>Note that Windows XP cannot rebalance resources in the same way that Microsoft Windows 
>98 does. After PCI resources are set, they generally cannot be changed. 
>
>If you change to an invalid IRQ setting or I/O range for the bus that a device is 
>on, Windows XP cannot compensate by rebalancing the resource that was assigned to 
>that bus. 
>
>Windows XP does not have this ability because of the more complex hardware schemas 
>that Windows XP is designed to support.
>
>Windows 98 does not have to support IOAPICs, multiple root PCI buses, multiple-processor 
>systems, and so on. When you are dealing with these hardware schemas, rebalancing 
>becomes risky and therefore is not implemented in Windows XP except for very specific 
>scenarios. 
>
>PCI devices are required to be able to share IRQs. In general, the ability to share 
>IRQs does not prevent any hardware from working. 
>
>The above is courtesy of article Q314068
>






Written in response to:
re: IRQs in WinXP (Everett: Thursday, July 11, 2002 at 7:51 pm)


There are presently no replies to this message.

• Reply or follow-up to this message

• Search this forum
• Start a new thread on a different subject

• Report abuse of the forum