Re: PCI ACPI/IRQ-routing broken on H77 chipset + Ivy Bridge (kernel3.5-rc7 and earlier)

From: Malte Schröder
Date: Thu Jul 19 2012 - 14:14:40 EST

On 16.07.2012 18:14, Bjorn Helgaas wrote:

> [CC +tglx]
> On Sun, Jul 15, 2012 at 2:25 PM, Rafael J. Wysocki <rjw@xxxxxxx> wrote:
>> CC-ing linux-pci and Bjorn.
>> On Sunday, July 15, 2012, Malte Schröder wrote:
>>> 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 pointed to
I tried the modifications to the DSDT that where proposed there and
voilà, the 3c905c started to work :)
So it seems Intel messed up their ACPI-stuff really bad for this
mainboard. I plan to do more testing during the weekend.

Malte Schröder
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