I have just built my own kernel with ACPI enabled, and tried booting it in a few systems. Some work, but 2 of them(a HP and a Dell desktop) hang at the line:
ACPI: PCI Root Bridge [PCI0] (0000:00)
I've tried disabling ACPI by adding append=noacpi into my lilo.conf, but that doesn't seem to help. I still get the message. Is there some other kernel parameter I'm missing in lilo.conf?