Re: PCI ACPI/IRQ-routing broken on H77 chipset + Ivy Bridge (kernel 3.5-rc7 and earlier)

From: Galen Seitz
Date: Tue Jul 17 2012 - 14:25:02 EST

Malte SchrÃder <maltesch <at>> writes:
> Hello,
> this is yet another try to get someone to look at this ;)
> I can't get PCI-devices to work on my DH77KC mainboard. I tested this
> using an AVM B1 ISDN card, a Fritz!PCI card and an old 3Com 905c NIC.
> I attached some dumps in case it helps. The CPU is a Core i7 3770.
> PCI hardware is detected by the kernel, but it gives IRQ errors. Using
> irqpoll allows the PCI card to somewhat work, but it is unreliable.
> There are some reports in Intel's support forums that also report
> PCI-problems with this mainboard, but Intel doesn't seem to be
> interested. So I hope this is something that is fixable on the kernel side.
> If there is more information needed, please let me know.

I was having similar problems with my DH77KC. I discovered that the
BIOS interrupt routing tables for the conventional PCI slots are incorrect.
See the discussion here:

Galen Seitz

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