diff -ruN linux-2.4.28.orig/drivers/acpi/bus.c linux-2.4.28/drivers/acpi/bus.c
--- linux-2.4.28.orig/drivers/acpi/bus.c	Wed Nov 17 03:54:21 2004
+++ linux-2.4.28/drivers/acpi/bus.c	Thu Dec  2 16:49:54 2004
@@ -1850,6 +1850,9 @@
 	acpi_status		status = AE_OK;
 	struct acpi_buffer	buffer = {sizeof(acpi_fadt), &acpi_fadt};
 
+	if (acpi_disabled)
+		return;
+
 	ACPI_FUNCTION_TRACE("acpi_bus_init");
 
 	status = acpi_initialize_subsystem();