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I always confuse the two, but one of them is a power and resources management thing ( I think). It had lots of problems with certain linux distributions.

That would be ACPI. Advanced Computer and Power Interface. Some older implementations are flaky, yeah, but I think newer hardware and the latest kernels have got it in the bag now so compatibility should be vastly better than before.

I found that APIC is 'Advanced Programmable Interrupt Controller'. Apparantly its 'Advanced' because it can handle multiple CPUs and usually has more interrupt lines than a standard PIC. FOLDOC is great.

I would think that a flaky APIC would bring your PC to its knees (not that I know all that much about it). But according to the Internet, those APIC kernel messages are harmless if infrequent.
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Hussein