PCIe Native Hotplug Integration with ACPI-Based Hotplug - Rafael Wysocki, Intel OTC
Currently, the native PCIe hotplug (pciehp) and the ACPI-based PCI hotplug (acpiphp) are mutually exclusive, which means that if one of them registers a hotplug slot, the other one will not be allowed to handle hotplug signalling for the device in that slot. That leads to problems on some systems and there seem to be reasons to remove that limitation and there's a question how it should be done. http://www.linuxplumbersconf.org/2013/