RE: IRQ routing problem

["Protasevich, Natalie" <Natalie.Protasevich@UNISYS.com>]

> I've been having interrupt problems. 2.6.12 worked fine, but 
> soon after it got broken and was still broken just now that I 
> checked git version.
> 
> Interrupts get somehow misrouted.
> 
> Here is a part from the syslog showing the problem:
> 
> Jul  3 13:17:09 kohtala kernel: USB Universal Host Controller 
> Interface driver v2.3 Jul  3 13:17:09 kohtala kernel: <7>Pin 
> 2-12 already programmed Jul  3 13:17:09 kohtala kernel: ACPI: 
> PCI Interrupt 0000:00:11.2[D] -> GSI 12 (level, low) -> IRQ 
> 20 Jul  3 13:17:09 kohtala kernel: PCI: Via IRQ fixup for 
> 0000:00:11.2, from 12 to 4 Jul  3 13:17:09 kohtala kernel: 
> uhci_hcd 0000:00:11.2: VIA Technologies, Inc. VT82xxxxx UHCI 
> USB 1.1 Controller Jul  3 13:17:09 kohtala kernel: uhci_hcd 
> 0000:00:11.2: new USB bus registered, assigned bus number 4 
> Jul  3 13:17:09 kohtala kernel: uhci_hcd 0000:00:11.2: irq 
> 20, io base 0x0000cc00 Jul  3 13:17:09 kohtala kernel: hub 
> 4-0:1.0: USB hub found Jul  3 13:17:09 kohtala kernel: hub 
> 4-0:1.0: 2 ports detected Jul  3 13:17:09 kohtala kernel: usb 
> 3-1: new low speed USB device using ohci_hcd and address 2 
> Jul  3 13:17:09 kohtala kernel: irq 20: nobody cared (try 
> booting with the "irqpoll" option)
> 
> Working kernel uses IRQ 12.
> 
Hi Marko,
Have you tried booting with "pci=noacpi" boot option?

Thanks,
--Natalie
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