[ACPI] PCI Hot Add on 2.6.0 down

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I am testing "PCI HotPlug" on Tiger (Intel chipset 870)
two categories of test with "ACPI PCI Hotplug driver" :
   hot replace (an adapter in the system is replaced by another)
   - kernel 2.4.20 or 2.6.0-test[4-5] with "ACPI PCI Hotplug driver", closing latch on slot PCI put on led in GREEN

   hot add (an adapter is added to the system)
   - kernel 2.4.20 , closing latch on slot PCI put on led in GREEN
   - kernel 2.6.0-test[4-5] , closing latch on one slot PCI put on led in AMBER

What differences can to explain this behavior ?

Any ideas are welcome...
Thanks.