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Date: Tue, 03 Feb 2009 23:35:33 -0500 (EST)
From: Len Brown <lenb@kernel.org>
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To: Thomas Gleixner <tglx@linutronix.de>
Cc: Andrew Morton <akpm@linux-foundation.org>,
       Sam Ruby <rubys@intertwingly.net>, LKML <linux-kernel@vger.kernel.org>,
       linux-acpi@vger.kernel.org, x86@kernel.org,
       "Maciej W. Rozycki" <macro@linux-mips.org>
Subject: Re: [APIC] Kernel panic, rsync corruption, intel q8200, 2.6.28-rc8
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> > > >> [    0.296001] ..MP-BIOS bug: 8254 timer not connected to IO-APIC
> > > >> [    0.296001] Kernel panic - not syncing: IO-APIC + timer doesn't work! 

just for the record, check_timer() is x86 IO-APIC code, not ACPI code.
So if the machine actually has MPS support, you'll probably get the 
same result with "acpi=off".  (of course if it doesn't have MPS,
then acpi=off would boot in uniprocessor legacy PIC mode)

cheers,
-Len