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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