How it works

A dummy plug is a small PCB that sits in an HDMI or DisplayPort socket and answers the GPU with a canned EDID table, usually advertising 1080p60 or 4K60. The host never sees a blank port; it sees a trusted sink, builds a normal mode list, and keeps compositing a full framebuffer. Remote tools (Screen Sharing, RDP, Parsec, Steam Link) then capture that framebuffer instead of a postage-stamp fallback or a black virtual screen.

Think of it as a key fob that tells the car the key is in the ignition. The engine (display engine) stays in the mode meant for a real driver (monitor), even though no panel is drawing pixels. The plug does not send an image to a TV; it only spoofs identity. That identity blob is EDID. A different problem is HDCP, the DRM handshake that can black-screen protected movie paths. Dummy plugs are for headless desktops, not for stripping DRM.

Match the connector: HDMI dongles for HDMI ports, DisplayPort dongles for DP outputs on GPUs and some docks. USB-C display paths need a separate adapter story. Many Apple Silicon Macs already create a software virtual display when no monitor is attached, so hardware is optional there. Intel Macs, Windows boxes, and Linux hosts that disable GPU modes without a sink still benefit from a physical plug.

When it matters

It matters when unplugging the only monitor collapses remote desktop to a tiny resolution, or when a studio rack, game-stream host, or NUC must stay headless 24/7. Pick 4K60 emulators when you want mode headroom; a 1080p stick is often enough for light Screen Sharing. Skip "EDID stripper" gadgets sold to defeat movie DRM. Those are not the headless use case.

A DisplayPort 4K60 dummy for GPU-heavy boxes, plus an HDMI 4K60 dummy for Macs and small PCs that expose HDMI.

The EVanlak 4K60 DisplayPort Headless Ghost Display Emulator plugs into a free DisplayPort output and spoofs a 4K60-class EDID so the GPU keeps full modes for remote desktop or rendering. View on Amazon when the machine's open socket is DP rather than HDMI.

The Furjosta HDMI Dummy Plug EDID Emulator 4K60 is a tiny HDMI EDID emulator aimed at headless desktops and Macs with a native HDMI port. View on Amazon when you need a cheap 4K60 virtual display for Screen Sharing or a studio rack.

For the identity blob these plugs spoof, see EDID. For the Mac headless workflow with BetterDisplay, read BetterDisplay and Dummy HDMI Plugs for Mac Headless Setups. For the DisplayPort link that carries EDID on many GPUs, see DisplayPort.