Verified November 3, 2026

DisplayPort Alt Mode over USB-C

DisplayPort Alt Mode over USB-C is a key check for portable monitors, docks, dongles, and laptop ports because a USB-C shape alone does not guarantee video output. It enables a single USB-C connection to carry display, USB data, and USB Power Delivery when the connected devices and cable support the required modes.

Entry type: USB-C external display compatibility reference

Specifications and details

Reference TypeDisplay connection standard
Primary ConnectionUSB-C
Display CapabilityExternal display output and dock pass-through
Travel RoleDisplay expansion
Applies ToLaptop or Tablet; Hub or Dock; Portable Monitor; Cable or Adapter
Battery Air Travel StatusNot Battery-Related
Power DirectionNot Applicable
Required Cable CapabilityVideo-capable USB-C required; full-featured USB-C cable for USB-C display and power combinations; certified USB-C to DisplayPort adapter cable preferred for DisplayPort monitors

Last verified: November 3, 2026

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