diff -ruN linux-2.4.26-pre5/arch/x86_64/kernel/pci-pc.c linux-2.4.26-pre5.x86_64-pci=noacpi-fix/arch/x86_64/kernel/pci-pc.c
--- linux-2.4.26-pre5/arch/x86_64/kernel/pci-pc.c 2003-11-29 00:28:11.000000000 +0100
+++ linux-2.4.26-pre5.x86_64-pci=noacpi-fix/arch/x86_64/kernel/pci-pc.c 2004-03-20 23:22:27.000000000 +0100
@@ -645,6 +645,9 @@
} else if (!strncmp(str, "lastbus=", 8)) {
pcibios_last_bus = simple_strtol(str+8, NULL, 0);
return NULL;
+ } else if (!strncmp(str, "noacpi", 6)) {
+ acpi_noirq_set();
+ return NULL;
}