On the nForce original with the onboard GeForce2 video, the BIOS does
assign IRQ 11 to the onboard video, however, Linux does not.  Setting
acpi=off and pci=noirq does not fix the problem.  I have a nForce2 board
without onboard video and ACPI/IO-APIC etc all work fine.

There is a strange entry in the dmesg log:

Pin 2-16 already programmed
    ACPI-1121: *** Error: Method execution failed [\_SB_.SRS_] (Node
cdf363c0),
AE_AML_BUFFER_LIMIT
    ACPI-1121: *** Error: Method execution failed [\_SB_.LNKE._SRS]
(Node cdf36dc0), AE_AML_BUFFER_LIMIT
ACPI: Unable to set IRQ for PCI Interrupt Link [LNKE] (likely buggy ACPI
BIOS).
Aborting ACPI-based IRQ routing. Try pci=noacpi or acpi=off
ERROR: Unable to locate IOAPIC for IRQ -19/n    ACPI-1121: *** Error:
Method execution failed [\_SB_.SRS_] (Node cdf363c0),
AE_AML_BUFFER_LIMIT
    ACPI-1121: *** Error: Method execution failed [\_SB_.LNKE._SRS]
(Node cdf36dc0), AE_AML_BUFFER_LIMIT
ACPI: Unable to set IRQ for PCI Interrupt Link [LNKE] (likely buggy ACPI
BIOS).
Aborting ACPI-based IRQ routing. Try pci=noacpi or acpi=off


I will also attach the dmesg as an attachment.

Here is the interrupts:

           CPU0
  0:     193151    IO-APIC-edge  timer
  1:       9633    IO-APIC-edge  keyboard
  2:          0          XT-PIC  cascade
  8:          4    IO-APIC-edge  rtc
  9:          0   IO-APIC-level  acpi
 12:       3012    IO-APIC-edge  PS/2 Mouse
 14:       8515    IO-APIC-edge  ide0
 18:          0   IO-APIC-level  EMU10K1
 22:   42753540   IO-APIC-level  eth0
NMI:          0
LOC:     193041
ERR:          0
MIS:          0

And the lspci -v:

02:00.0 VGA compatible controller: nVidia Corporation NV15 [GeForce2 -
nForce GPU] (rev b1) (prog-if 00 [VGA])
        Subsystem: nVidia Corporation: Unknown device 0c11
        Flags: bus master, 66Mhz, medium devsel, latency 32, IRQ -19
        Memory at e5000000 (32-bit, non-prefetchable) [size=16M]
        Memory at e8000000 (32-bit, prefetchable) [size=128M]
        Expansion ROM at e7ff0000 [disabled] [size=64K]
        Capabilities: [60] Power Management version 2
        Capabilities: [44] AGP version 2.0