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SubjectRe: [Bug 41722] Clevo M5X0JE hangs in ACPI init
Hi there, Linus.

On Jan 06 2012, Linus Torvalds wrote:
> 2012/1/6 Rogério Brito <rbrito@ime.usp.br>:
> >
> > For the record, *some* description of the problem is at:
> >
> > * https://bugzilla.kernel.org/show_bug.cgi?id=41132
>
> This one looks very much like the thing that Edward Donovan fixed
> fairly recently in commit 52553ddffad7 ("genirq: fix regression in
> irqfixup, irqpoll")

It does look similar, but not quite the same. And, yes, my main desktop (the
one that I'm using right now) was affected by Edward's commit, which, BTW,
has my Reported-and-tested-by.

This one is different. Here is a brief summary of the situation:

# Computer description

* Rebranded Clevo M5X0JE
* nForce2 chipset
* AMD Sempron CPU
* NIC with driver forcedeth
* wifi rtl8187

# Booting options

The current working options passed to the kernel are: `acpi=off pnpbios=off noapic`

It doesn't boot with a vanilla kernel. It only boots when I pass the options
above *and* compile the kernel with the following patch applied:

,----[ do_not_size_subtractive_decoding_transparent_pci_to_pci_bridges.patch ]
| diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
| index 86b69f85..84543f5 100644
| --- a/drivers/pci/setup-bus.c
| +++ b/drivers/pci/setup-bus.c
| @@ -849,6 +849,10 @@ void __ref __pci_bus_size_bridges(struct pci_bus *bus,
| break;
|
| case PCI_CLASS_BRIDGE_PCI:
| + /* don't size subtractive decoding (transparent)
| + * PCI-to-PCI bridges */
| + if (bus->self->transparent)
| + break;
| pci_bridge_check_ranges(bus);
| if (bus->self->is_hotplug_bridge) {
| additional_io_size = pci_hotplug_io_size;
`----

Otherwise, it hangs right when trying to configure PCI, which, according to
the dmesg log when it boots occurs approximately 0.12 seconds after the
kernel shows its first message.

> So that should be fixed in 3.2 (and it's marked for stable, so I think
> it's in the latest stable kernels too)
>
> > * https://bugzilla.kernel.org/show_bug.cgi?id=41722
>
> That, however, looks totally insane. I don't even have a clue where to
> begin. I take it that it works with "acpi=off", and don't have a clue
> about what might go wrong with ACPI enabled.

Yes, with acpi=off it "works" (well, it seems that without ACPI many things
don't get enabled). At least mom was able to visit a site like Gmail to
check her email.

She would like say that she is positively impressed with the committment of
the community with a case of a layman person and she told me to send you all
big thank you.


Thanks from me also,
--
Rogério Brito : rbrito@{ime.usp.br,gmail.com} : GPG key 4096R/BCFCAAAA
http://rb.doesntexist.org : Packages for LaTeX : algorithms.berlios.de
DebianQA: http://qa.debian.org/developer.php?login=rbrito%40ime.usp.br
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