To add more information it seems that on a fresh config ACPI is accessible because SMP is on by default but as soon as you turn SMP off ACPI section is locked and you can't get into it anymore. This is very bad for my single processor laptop. :-(
More information:
This is now filed as bug [1]. Basically, the problem is that ACPI is dependent upon Local APIC being turned on. To me, this seems like a bad idea as my machine has no local APIC but requires ACPI. Judge for yourselves.
[1] http://bugme.osdl.org/show_bug.cgi?id=1117
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