18.5. Hotplug with PCI

Some computers also allow hotplug for PCI devices. To make full use of this, special kernel modules must be loaded. However, these modules can cause problems on non-PCI hotplug computers. Unfortunately, hotplug PCI slots cannot be autodetected. To configure it manually, set the variable HOTPLUG_DO_REAL_PCI_HOTPLUG in file /etc/sysconfig/hotplug to yes.

SUSE LINUX Administration Guide 9.3