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Double-Dutched on IRQ Assignments :(


I hope some of you can help me tackle this problem. My brother recently bought a Gigabyte GA-7N400-L motherboard with NVIDEA nForce2 chipset. Running on Win98SE, with an AuthenticAMD Sempron(tm) 2500+ Pocessor, 512MB Ram, nVidea GeForce4 MX 400 128MB Graphics card, and a 120GB Western Digital HD.

I downloaded and installed all the Win98SE updates for him. I disabled onboard Lan and Audio from the BIOS, because he doesn't want his PC for internet access (so no modem required), and he intends to buy an external soundcard for audio recording. The PCI Bus in the Device manager keeps showing up in error mode, so I looked in the Problem Devices section of the System Information. I'm looing at a long list of PCI related problems with "ACPI IRQ Holder for PCI Steering' entries. What have I done wrong?

Is windows failing to read the Nvidea motherboard drivers correctly? Please help me Sad......thank you for your time and patience.

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Check for latest Bios....
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Mobo drivers?

Did someone forget to install/update these?

Just an opinion, when you plunk that old OS into new hardware you might have to fuss a bit to get all the proper pieces to make everything happy.

Off the shelf pieces are designed for XP.

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Still tugging at the forelock :)

Thanks guys for your replies! I took Michael's advice and Flashed the Bios (saving the current Bios settings also).

Rebooted, and I'm back in Device Manager. Everything is showing up dandy, with no known conflicts (The Root Hub and Host Controllers are now correctly listed). But System Information still reports the ACPI/IRQ mis-match. I've noticed that some IRQ Assignments are duplicated:

SMBus Cntrlr 11 (IRQ)
Display Cntrlr 11 (IRQ)
USB 1.1 Host Cntrlr 9
ACPI Controller 9 (IRQ)
USB 1.1 Host Cntrlr 5 (IRQ)
USB 2.0 Host Cntrlr 10 (IRQ)
IDE Cntrlr 14(IRQ).

Is there a way I could assign the correct numbers to the duplicated ones? Or is it (as bob suggested) part and parcel of an old OS? Thanks again for keeping me informed Happy

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1. The article [Q182628] explains the settings Windows uses when programming IRQ steering and the computer's basic input/output system (BIOS) PCI bus IRQ steering relationship.

2. The article [Q182604] explains that Windows provides support for PCI bus IRQ steering which dynamically assign or "steer" PCI bus IRQs to PCI devices. The steering provides the flexibility to reprogram PCI interrupts when rebalancing Plug and Play PCI and ISA resources around non-Plug and Play ISA devices.

3. Supplemental reading:

a. "Explanation of Error Codes Generated by Device Manager (Q125174)."

b. "ACPI IRQ Holder for PCI IRQ Steering" Problem Device Entry in System Information Tool (Q272291), Windows Millennium.

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Checking out the links

Thank you CursorCowboy. I'll be checking out those Articles over the weekend. Apologies for not getting back sooner Happy

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