Alt Mode is a term you will come across frequently when investigating USB-C.
Alt Mode is a functional extension of USB-C which enables the USB connection to carry non-USB signals. Alt Mode[s] are optional capabilities that are unique to the USB-C connector or port that allow technologies, like DisplayPort and Thunderbolt 3, to be transmitted. Knowing what devices and ports support the various Alt Modes may be confusing and, at times, frustrating.
DisplayPort over Alt Mode
DisplayPort Alt Mode [DP Alt Mode] allows a USB-C equipped computer to connect directly to a display or monitor. The monitor will need to have a USB-C port for you to make this connection. You can still use a USB-C equipped laptop with monitors that have more traditional video ports, such as VGA, DVI, HDMI, and DisplayPort but you will need to get a USB-C video adapter.
What do I need to know before using DisplayPort over Alt Mode?
- Confirm your computers USB-C port supports DP Alt Mode
- Read the tech specs on the USB-C video adapter to ensure it supports the resolutions and refresh rates you want
- If you are interested in a USB-C MST video adapter or laptop docking station, make sure your video card also supports MST
What to Check: DisplayPort over Alt Mode.
- Always check the specification of the devices you are going to use. So the Laptop, PC or another source device.
- Also check the specification of the connecting cables and adapters you are using [also if there Uni- or Bidirectional].
- Check the specification of the required output device.
- Make sure they support the USB C over Alt Mode!