From mboxrd@z Thu Jan  1 00:00:00 1970
From: Claus Rosenberger <Claus.Rosenberger@rocnet.de>
Subject: Re: Freeze with 2.6.32.19 and xen-4.0.1rc5
Date: Tue, 24 Aug 2010 09:50:19 +0200
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>>> 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.