--- title: An HDMI dummy plug might be the smallest cheap gadget... description: An HDMI dummy plug is a small, inexpensive dongle that simulates a connected display, solving several niche but real problems. Without a display detected,... canonical: https://daily.dev/posts/an-hdmi-dummy-plug-might-be-the-smallest-cheap-gadget-that-s-actually-useful-n2ebmdoah twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: An HDMI dummy plug might be the smallest cheap gadget that's actually useful | daily.dev og:description: An HDMI dummy plug is a small, inexpensive dongle that simulates a connected display, solving several niche but real problems. Without a display detected,... og:url: https://daily.dev/posts/an-hdmi-dummy-plug-might-be-the-smallest-cheap-gadget-that-s-actually-useful-n2ebmdoah og:image: https://api.daily.dev/og/posts/N2EbmdOaH.png og:image:alt: An HDMI dummy plug might be the smallest cheap gadget that's actually useful og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # An HDMI dummy plug might be the smallest cheap gadget that's actually useful **[XDA Developers](https://daily.dev/sources/xda-developers)** · 4 min read · 0 upvotes · 0 comments ## Summary An HDMI dummy plug is a small, inexpensive dongle that simulates a connected display, solving several niche but real problems. Without a display detected, headless PCs default to 1024x768 resolution during remote sessions — the dummy plug forces the GPU to output at full resolution. It also enables game streaming services like Steam In-Home Streaming, Moonlight, and Sunshine to function properly on headless hosts. A secondary use case is keeping HDMI audio alive on devices like the Mac Mini, which won't pass audio without a detected display. Software alternatives like Windows 11's virtual display driver or the open-source Virtual Display Driver Wizard exist, but the hardware dongle is OS- and driver-agnostic. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### Why does my remote desktop session show only 1024x768 when my PC has no monitor connected? Without a detected display, the GPU falls back to a default resolution of 1024x768. Plugging in an HDMI dummy plug tricks the GPU into thinking a monitor is connected, allowing the remote session to negotiate full resolution — such as 2560x1440 — instead of the low fallback. This applies to both remote desktop tools and game streaming services like Moonlight and Steam In-Home Streaming. _Developers running headless rigs track hardware workarounds like this on daily.dev._ ### How do I keep HDMI audio working on a Mac Mini when no display is connected? The Mac Mini will not pass audio through its HDMI port unless it detects an active display. Inserting an HDMI dummy plug into the HDMI port fools the Mac Mini into believing a TV or projector is connected, keeping the HDMI audio output active so you can route sound to a home theater receiver without powering on a screen. _Mac Mini home server setups and similar niche configurations get covered regularly on daily.dev._ ### Is there a software alternative to an HDMI dummy plug for creating a virtual monitor on Windows? Yes — the open-source Virtual Display Driver Wizard on GitHub lets you create a virtual monitor inside Windows without occupying a physical port. Windows 11 also has built-in support that reduces the need for a dummy plug. The hardware dongle remains useful because it is OS- and driver-agnostic, working identically on Windows, Linux, or macOS. _Those choosing between hardware and software display solutions find comparisons like this on daily.dev._ ## Similar posts on daily.dev - [A tiny $4 HDMI dummy plug somehow fixed my entire game streaming setup](https://daily.dev/posts/a-tiny-4-hdmi-dummy-plug-somehow-fixed-my-entire-game-streaming-setup-2czbgzkfg) · XDA Developers · 3 upvotes · 0 comments - [Stopping the smart TV from being used against you](https://daily.dev/posts/stopping-the-smart-tv-from-being-used-against-you-b1xuucq0q) · Lobsters · 0 upvotes · 0 comments - [4 HDMI gadgets I wish I’d discovered a lot sooner](https://daily.dev/posts/4-hdmi-gadgets-i-wish-i-d-discovered-a-lot-sooner-e8hsam9ek) · XDA Developers · 0 upvotes · 0 comments - [NCSC's first gadget blocks malware transfer over HDMI cables](https://daily.dev/posts/ncsc-s-first-gadget-blocks-malware-transfer-over-hdmi-cables-uhq4tlq7g) · The Register · 1 upvotes · 0 comments --- [View this post on daily.dev](https://daily.dev/posts/an-hdmi-dummy-plug-might-be-the-smallest-cheap-gadget-that-s-actually-useful-n2ebmdoah) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"An HDMI dummy plug might be the smallest cheap gadget that's actually useful","url":"https://daily.dev/posts/an-hdmi-dummy-plug-might-be-the-smallest-cheap-gadget-that-s-actually-useful-n2ebmdoah","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/an-hdmi-dummy-plug-might-be-the-smallest-cheap-gadget-that-s-actually-useful-n2ebmdoah"},"datePublished":"2026-08-08T13:31:56.936Z","dateModified":"2026-08-08T13:32:30.141Z","description":"An HDMI dummy plug is a small, inexpensive dongle that simulates a connected display, solving several niche but real problems. 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Plugging in an HDMI dummy plug tricks the GPU into thinking a monitor is connected, allowing the remote session to negotiate full resolution — such as 2560x1440 — instead of the low fallback. This applies to both remote desktop tools and game streaming services like Moonlight and Steam In-Home Streaming. Developers running headless rigs track hardware workarounds like this on daily.dev."}},{"@type":"Question","name":"How do I keep HDMI audio working on a Mac Mini when no display is connected?","acceptedAnswer":{"@type":"Answer","text":"The Mac Mini will not pass audio through its HDMI port unless it detects an active display. Inserting an HDMI dummy plug into the HDMI port fools the Mac Mini into believing a TV or projector is connected, keeping the HDMI audio output active so you can route sound to a home theater receiver without powering on a screen. 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