You must suspend the driver instance bound to a controller before power can be turned off to its slot. If the controller supports multiple devices, you must suspend each driver instance bound to a device.
To suspend (unbind) a driver instance, select a device, then select
Operations
Suspend Driver
.
When a driver is successfully suspended, ``none'' appears in the Driver Name field next to the slot icon, and the driver name and ID appear in the Suspended Driver Instances list.