The USB-C video cable or adapter you are using must be connected to the Thunderbolt 3 port on the back side of the NUC. The front-mounted USB-C port within the NUC is for data transfers only, it is not capable of providing a video output signal. U/futureAlec brings up an excellent point that I had not considered (thank you for doing so). All things being equal, the most simple explanation is usually the right one, so. You cover a lot of different ground in your reply, and I fear it may take us away from the core problem at hand. Since a video signal is only 'one way' going out from the host, this is why the security controls do not apply.
#HDMI TO INTEL THUNDERBOLT 3 SOFTWARE#
The security features of the Thunderbolt software are intended to prevent external devices from accessing data on the host. This is because a display is an output device, not an input device.
When an actual Thunderbolt 3 device is used between the host and the display (for example a Thunderbolt 3 docking station), displays connected in such a manner will always work regardless of authentication or approval status within the Intel Thunderbolt Control Center Software. You are using the USB-C Alt Mode Video output capability of the Thunderbolt 3 port to drive the display, but the external device is not in fact a Thunderbolt 3 device.ī.
If you are connecting the display using a USB-C to HDMI or DisplayPort video cable you are not in fact connecting a Thunderbolt 3 device to the host. You may also want to double-check within the Windows 'Display Settings' application to ensure that the Thunderbolt 3/USB-C connected display is not mistakenly marked as 'Disconnected' (this can happen from time to time)Īll that said, I do not believe that a Thunderbolt 3 authentication issue is the cause of the problem.
#HDMI TO INTEL THUNDERBOLT 3 DRIVER#
I would also recommend ensuring that you have the latest Intel GPU driver installed. The Intel Thunderbolt Control Center installation should be triggered automatically after the Thunderbolt 3 DCH driver is installed, but it can be installed manually if needed. Once installed (or confirmed having been already installed) I would also suggest ensuring that you have the latest version of the Intel Thunderbolt Control Center application installed from the Microsoft Store. You do not mention it specifically, but if you have not already I would recommend ensuring that you have the latest Thunderbolt 3 DCH driver installed for the system's Thunderbolt 3 host controller.