The DisplayPort Alternate Mode lets you project video and play audio on an external display that supports DisplayPort. USB Type-C has a new feature called Alternate Modes. If your USB-C cable has this feature, you can connect to non-USB devices that support the same Alternate Mode. For example, if your USB-C cable has the Thunderbolt Alternate Mode, you can connect to Thunderbolt devices. There's no setting to turn on—your device automatically uses the appropriate mode if it's supported.

USB-C to Display Port not working? - Microsoft Community USB-C to Display Port not working? - Microsoft Community

If you have a spare cable lying around, it might not be good enough, unfortunately, as most HDMI cables don’t tell you what version they are. HDMI is the standard connection used by most televisions and monitors, and should be familiar to most people. Be aware, however, as there are variants. There are micro-HDMI and even mini-HDMI connectors, as well as the standard full size, so make sure you select the right cable.The device or dongle you connected to has new features for USB-C that your PC (or phone) doesn’t support. The MHL Alternate Mode lets you project video and play audio on an external display that supports MHL.

DisplayPort over USB-C | Dell UK DisplayPort over USB-C | Dell UK

The best part about DisplayPort connections is that the higher bandwidth ensures almost no compression, especially when it comes to high-resolution content. A PC with USB Type-C connectors has larger power limits. If the connector supports USB Power Delivery, it can charge even faster at greater power levels. To charge faster, your PC (or phone), charger, and cable must all support the industry standards. Your charger and cable must also support the power levels your PC (or phone) requires for the faster charging. For example, if your PC requires 12V and 3A for the fastest charging, a 5V, 3A charger won’t give you the fastest charging. So you’ve got your cable and you’ve connected it up. You may well find that Windows has done the rest for you, and your monitor is now duplicating everything on the built-in screen. I wanted to know if through an adapter, I could connect the old MBP from its Mini-DisplayPort to the USB-C of the monitor and have a video signal.

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Make sure the device or dongle is connected to the USB-C port on your PC (or phone) that supports the correct Alternate Mode. For example, if you're connecting a Thunderbolt Alternate Mode device, make sure you connect to the USB-C port that supports Thunderbolt.