Attached patch includes the I/O space fix and applies to 2.6.3.
This should also solve the problem Maeda-san reported in January
(sorry for replying so late!)

Here are changes in the patch:

 - fix the acpiphp driver not powering down a PCI card (from Gary Hade)
 - fix I/O space size calculation and ISA aliasing (from Gary Hade)
 - fix some debug messages
 - only execute ACPI methods on the first existing function