Hi Benoit,

This line in your dmesg:

quoted text
> pciide1: using irq 15 for native-PCI interrupt

is highly suspicious, especially since your machine also has pciide0.

Can you send me dmesg for the following cases too:

GENERIC with acpi enabled
GENERIC.MP
GENERIC.MP with acpi enabled

and the output of

# acpidump -o M2N-MX

The latter produces several files; please create a tar file that
contains them and send me that.

Hopefully this will help me figuring out what goes wrong here.

Thanks,

Mark