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Event ID: 6 Source: ACPI

Source
Level
Description
IRQARB: ACPI BIOS does not contain an IRQ for the device in PCI slot <value> function <value>.
Comments
 
From a support forum "Motherboards have IRQ Mappings for the PCI slots - on most only Slots #2 & #5 have what's called Independent IRQs, ( not shared with other slots or onboard devices).  Most modern PCI Cards are capable of IRQ sharing. However, if your Motherboard is older it may not have a "Extensible" IRQ table of 23 IRQs but only 15. If that's the case, then the system may be out of IRQs to assign and that is why you are getting that error. If possible, I would try and move the card currently in Slot #6 to either slot 2 or 5 and see if that resolves the ACPI error."
The first step in troubleshooting this issue is to update the firmware for the motherboard, the chipsets and the various PCI adapters installed on the computer. If this fails to fix the problem, a common suggestion is to move the PCI card currently in the slot mentioned in the event to another PCI slot.

From a user with an ASUS motherboard that was experiencing this problem: "I went to the Asus site and downloaded the ATK0110 ACPI Utility. I had the same problem on my Asus M2N SLI Deluxe motherboard and it fixed the problem."
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. See ME930062 for additional information about this event.

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