Re: [Xen-devel] Freeze with 2.6.32.19 and xen-4.0.1rc5, acpi problems

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

 On 08/24/2010 01:16 AM, Pasi Kärkkäinen wrote:
> On Tue, Aug 24, 2010 at 09:50:19AM +0200, Claus Rosenberger wrote:
>>>>> 2.6.31.9 but thats not a pvops kernel.
>>>>>
>>>> Does someone have ideas why the system would silently lockup (freeze)
>>>> without those "acpi=ht noapic noirqbalance" options? 
>>>>
>>>> Afaik this is an Intel DQ45CB motherboard, which has been used by many 
>>>> people/developers.
>>>>
>>> Oh, one more thing.. 
>>>
>>> Claus: Please try those options separately,
>>> to figure out which one of those is the important one.
>>>
>>> -- Pasi
>>>
>>
>> I checked out these options, following result
>>
>> - acpi=ht noapic     => worked
>> - noapic             => didn't work, disk errors while booting, no 
>> functional system
>> - acpi=ht apic=debug => worked
>>
>> So it seems i definitly need the option acpi=ht or acpi=off or something 
>> like that.
>>
> Keir, Jeremy: Any idea why acpi=ht is needed to make Intel DQ45CB (Q45 
> chipset) work?
>
> Without "acpi=ht" the system freezes randomly without any 
> log/debug/serialconsole output..

At a random guess, there's something strange about the SCI interrupt. 
When booting native, does "acpi" get irq 9 or something else?  Is there
a BIOS setting relating to SCI or ACPI interrupts?

    J

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