An HDMI dummy plug might be the smallest cheap gadget that's actually useful

Published Aug 8, 2026, 9:30 AM EDT A seasoned mechanical design engineer turned tech reporter and reviewer, Chandraveer brings more than four years of consumer tech journalism experience to the table, with bylines at Android Police and iPhoneHacks. He's written about everything from UI and UX changes across various apps to emerging software and AI trends. At XDA, he showcases his versatility in the tech reporting space with articles rooted in personal experiences and frustrations. Chandraveer's passion for consumer tech spills over into hobbies such as mechanical keyboards, photography, and 3D printing. With an academic background in design and manufacturing, his insatiable curiosity spans beyond the digital domain. Chandraveer's downtime is an eclectic mix of reading fiction, practicing calligraphy, conceptualizing new products, and enjoying an expansive FLAC audio library. Of all the tech gadgets I've bought over the years, from programmable keyboards to obscure adapters, none has delivered quite as much utility for such a low price and tiny footprint as a humble HDMI dummy plug. It's a tiny, unassuming dongle that you could easily mistake for a flash drive or a dust cover that your GPU comes with. Tiny as it is, this gadget has helped me solve a very specific set of problems, and it now lives in my USB drawer because it gets about as much use as a flash drive. On countless occasions, it has helped me remote into my PC without hiccups or typical low-resolution display output. The HDMI protocol has its fair share of problems and little hassles that make everyday computing a frustrating experience. For instance, my GPU likes to nap if there's no display connected and switched on. It relies on the connected HDMI to know when it's needed, and simply plugging in one end of a random HDMI cable, or powering off my monitor after initialization, simply doesn't work. This is where I needed to trick my PC into believing there's an active display connected to the GPU, using this little HDMI dummy plug. The headless setup horsepower bottleneck Why must I suffer the default resolution? Although the HDMI dummy plug is a fairly generic device that's quite easy to make at home, if you're good with the soldering iron. Before we get into all that, you might wonder why I'd want to use my PC in a headless setup, lacking a display. There are at least two use cases I can think of immediately. First, when I remote into a PC using a low-powered laptop, I don't need this PC to have any I/O accessible on location so long as it is powered on. However, when the GPU cannot detect a connected display or monitor, the remote client defaults to a rather low default resolution of 1024x768 pixels. This is an immediate downgrade from my 2560x1440 pixel monitor at home, and still lower than my 1080p laptop screen. A dummy plug tricks the PC into thinking there's an active 4K display connected to the GPU. These plugs contain a tiny chip with a resistor that reports a set of display information known as EDID, often simulating a 1080p or even a 4K display. This little technicality makes my remote desktop sessions run at the high resolution the dummy plug is simulating. This is an absolute game-changer for anyone remotely accessing a powerful workstation for tasks like video editing, 3D rendering, or CAD work, where both high resolution and full GPU acceleration are non-negotiable. Another benefit that's not talked about as much is how I can just switch off any displays physically connected to this PC I'm remotely operating. This prevents any local bystanders from potentially watching what I'm doing on the machine. Game streaming is a lot easier, too A surprisingly simple solution Another major beneficiary of this clever little gadget is the game streaming enthusiast. Services like Steam In-Home Streaming, Moonlight, or Sunshine are fantastic for playing PC games on a laptop in another room, on your phone, or on a TV via a small client device. However, these services rely on the host PC actively rendering the game on a display to capture and stream the video feed. If the host PC is headless or if its main monitor is turned off, the streaming session might fail to start or remain locked to a lower resolution, like with the remote troubleshooting sessions I described above. The HDMI dummy plug elegantly solves this. By plugging it into the GPU you use for gaming, you ensure that the graphics card is always active and rendering into a virtual display. This allows you to tuck your powerful (and potentially loud) gaming PC away in a closet or another room and stream games flawlessly without a physical monitor attached and powered on that keeps you tethered to the desk. It provides the freedom to build a dedicated, headless gaming server that can be accessed from anywhere in your home. You shouldn't need to trick your PC Unless you love audio over HDMI Credit: The Pi Hut While the primary purpose is to simulate a visual display, the utility of an HDMI dummy plug extends to other niche but critical scenarios. For instance, some computers, like the Mac Mini, are popular as compact media servers connected to home theater receivers via HDMI. Reddit user /u/DonFrio shared a peculiar issue that can arise where the Mac Mini won't pass audio through the HDMI port unless it detects a display, like a TV or projector, is connected and switched on. This is inconvenient if you just want to listen to music through your stereo system without having to power on your large screen. An HDMI dummy plug solves this by ensuring the Mac Mini always thinks a display is active, keeping the HDMI audio output alive. Furthermore, in the world of high-performance computing, some GPU-intensive tasks like scientific calculations, data rendering, or even crypto mining can see performance degradation if the GPU goes into a low-power state because no monitor is detected. A dummy plug guarantees that the graphics card remains fully engaged and delivers its maximum performance. That said, Windows 11 has since eliminated the need to use a dummy HDMI gadget like this. If you're a stickler for software solutions, you'll love that projects such as the Virtual Display Driver on GitHub offer a way to create a virtual monitor within Windows itself, achieving a similar result without occupying a physical port. I still swear by the dinky little dongle because software solutions are OS-specific, while this little dongle is a plug-and-play solution that's both driver and OS-agnostic. Yes, it is niche, but useful I won't delude myself into believing this HDMI dummy plug is something every single computer user should get, and that's perhaps why all the options available online are rather generic. For the vast majority of PC users who have their computer hooked up to a monitor they use every day, it's entirely unnecessary. Its true value is realized in slightly unconventional setups like headless server workstations, remote desktops, and dedicated game streaming rigs. In some of these use cases, the dummy plug directly enables the entire setup. It just goes to prove that everything useful doesn't need a large shipping package or a huge expense. For just a few dollars, you can solve a problem that might otherwise seem insurmountable.