APIC not enabled on Opteron

Hi,

I'm not postive if my problem is being caused by ACPI, but it seems to be involved, so I'm posting my questiong here first. If this is not an ACPI issue just let me know.

I have a single processor Operteron motherboard with the Nvidia nforce 3 chipset. I am running a 32-bit Linux kernel (2.4.6-test3) and things are perfectly stable. The problem is that the system is running in XT-PIC mode even though I enabled Local APIC support. Here is the contents of /proc/interrupts:

CPU0

  0:      53477          XT-PIC  timer
  1:        115          XT-PIC  i8042
  2:          0          XT-PIC  cascade
  8:          1          XT-PIC  rtc
  9:          0          XT-PIC  acpi
 12:         60          XT-PIC  i8042
 14:      62385          XT-PIC  ide0
 15:          1          XT-PIC  ide1
NMI:          0
LOC:      53266
ERR:          0

This may not look too crowded, but when drivers are loaded for all the onboard hardware there is a lot of sharing going on. I also tried enabling the IO-APIC, which works, but I still only get 15 IRQs.

The reason I think ACPI is involved is because of this kernel message:

Using ACPI for processor (LAPIC) configuration information

I have attached the full kernel log. If anyone can give me a clue, I'd appreciate it.

Thanks

Mike

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