why does selecting ACPI now require PNP?

[david]

in the current thread 'long term regression' we're troubleshooting 
printing problems that seem to be triggered by ACPI_PNP. in sometime 
between 2.6.18 and 2.6.22 configuring ACPI started forcing ACPI_PNP even 
if PNP was otherwise disabled.

given the recent discussion on ACPI forcing HOTPLUG_CPU I thought it 
appropriate to ask the question of why configuring ACPI should then enable 
PNP?

David Lang
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