The NI-VXI driver allows the user to power on and off the VXI chassis after powering on the host workstation, without having to power cycle, by enabling the VXI Variable Power On Function (VPO). The VPO function can be enabled through NI Measurement & Automation Explorer (MAX).
The VPO function is not supported on systems that have PCI Express Native Control enabled. In order to use the VPO feature, the user will need to disable the PCI Express Native Control on the system with the following procedure:
PCI Express Native Control can be re-enabled by an administrative user by entering the following command at the Command Prompt: "bcdedit /set pciexpress default".
In some cases enabling VPO can result in the system entering a state where Windows hangs during boot. If this occurs, the system can be restored through the following procedure: