Sorry for the typo...

The correct one is of course: pci=noacpi

ACPI = Advanced Configuration and Power Interface
APIC = Advanced Programmable Interrupt Controller

AFAIK acpi uses apic to get the irq-routing (to get around the legacy "only 
15 irq"), but when you tell 'pci=noacpi', you gives the control of pci irq 
to bios (and thereby limits the irq-addressing on the pci bus to the 15 
legacy irq, as an "compability mode")

There is actually even a message in dmesg when booting noapic and acpi=off that says 
that it cannot find an interrupt for the hpt372 controller onboard and suggests using 
pci=biosirg, or something like that.

I'm also getting some instability with pci=noacpi that I was not getting with acpi=of.

Gregory K. Meyer

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