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The USB-C port of a Dell C1422H, Dell P1424H, or Dell Pro 14 Plus Portable Monitor P1425 may not display video when connected to a computer. Affected Platforms: Dell C1422H Dell P1424H Dell Pro 14 Plus Portable Monitor P1425
The device that is connected to the monitor causes this problem. The USB-C port must support DisplayPort Alt Mode (DP Alt Mode), or a Thunderbolt port must be used. If the USB-C port only supports data or power delivery, no video is seen. This may also be caused by using a USB-C to DisplayPort (DP) cable or USB-C to HDMI cable. Only a USB-C to USB-C cable may be used to display video using USB-C.
Use a Thunderbolt port or a USB-C port that supports DP Alt Mode. If neither of these are present, use a different monitor input type. A Thunderbolt USB-C port or a DisplayPort USB-C port on a computer can both support DP Alt Mode. USB 2.0 and SuperSpeed USB ports on a computer do not support DP Alt Mode. Note: If the USB-C port is unmarked, check your computer’s manual for more information about if DP Alt Mode is supported.
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