I'm attaching dmesg. Booted linux-next 20091228 with "lapic acpi=ht",
acpi=ht gets over the solid lock up on HDA intel line as shown below. In
dmesg it's saying this is not a SMP motherboard - it's an Asus M2N32-SLI
deluxe with a 64X2, yet every kernel up to 2.6.32-git1 is fine with 2
CPU's. BIOS updated a few months ago, will check if a later one is
available.
The lock up
============
ACPI: PCI Interrupt Link [AAZA] enabled at IRQ 21
HDA Intel 0000:00:0e.1: PCI INT B -> Link[AAZA] -> GSI 21 (level, low)
-> IRQ 21.
Regards
Sid.
-- 
Sid Boyce ... Hamradio License G3VBV, Licensed Private Pilot
Emeritus IBM/Amdahl Mainframes and Sun/Fujitsu Servers Tech Support
Specialist, Cricket Coach
Microsoft Windows Free Zone - Linux used for all Computing Tasks