HDMI Dummy Plug Headless Ghost Display Emulator Premium Aluminum PC（Fit Headless-3840x2160@60H New 3RD）-1Pack

Frankly, I didn't expect it to work. It works great! Simple solution that yields improved processing speed. Hooray!

I used this solve an issue with Steam Remote Play. I wanted the beefy machine in the livingroom to stream 4k to a laptop connected to a 4k TV in the home office. The only way I could do that was turn on the projector in the living room, which defeated the purpose of remote play to begin with for me.Here's my setup so you can understand the problem.I have beefy system in the living room connected to a 1080p projector w/ surround sound, projecting to 120" screen. I usually use Nvidia's DSR to render to 4k, but output it to 1080p, naturally resulting is a more detailed (but naturally not as good as a native 4k display would be) 1080p experience, that looks really good at 120".In the home office, is my lenovo 2-in-1 i use for school and basically everything on the go. It's connected to a 4k HDR TV.If the projector in the living room is off, then Steam Remote Play will only stream a 1080p signal to the laptop in the office connected to the 4k display. In fact, it's almost like DSR is disabled once the projector is turned off because I can't even select any resolution above 1080p.If I turn the projector in the living room on, it's like DSR works again and I can pick resolutions higher than 1080p, including 4k, and stream at 4k to the laptop in the office.I don't want to burn up lamp hours on my projector just so I can play a game in the home office at 4k.I've researched a solution to this on and off for over a year and came up with everything from modifying EDID, to other stranger methods.It's seems like it would be such a simple fix, but alas, it is frustratingly not.Until now. I found out about devices like these. Put it into a spare HDMI port and walah. As acts as an active display. This worked great. I mirrored my monitor to this fake display and now even with the projector off, I have the option to stream 4k to my laptop in the home office.Wish I had discovered this a year ago.

I have an old Dell that I use as a Plex server that is running Ubuntu Linux. I have been struggling with getting VNC remote access to work properly because there was a huge delay. I found a forum post that mentioned it being a video issue with the way Linux works and they suggested putting a HDMI dummy plug on it. This has solved all of my problems. I am now able to place the unit on a shelf with only power and network going to it and haven't had a single issue remotely connecting to it.

Used to get 4k over VNC from my laptop. Without this in the laptop's HDMI port, you can only get HD.

While the dummy plug adapter does advertise to the OS that 3840x2160@120Hz is available, it is not possible to switch to that mode. I have verified this with three different adapters (I bought a three-pack) on two different computers, one with an EVGA RTX 3070 and the other with an RTX 4070 Super Founders edition. These will be returned.EDIT: Having more experience with these now, the issue was likely that the plug doesn't support 4K 120Hz higher than 8-bit color, meaning no HDR. The plug may work in 4K 120Hz 10-bit color mode, when connected to a DisplayPort 1.4 to HDMI 2.1 adapter. I'm not sure why the latter brings this functionality, but it has worked on other 4K 120Hz plugs.

To be fair, they didn't claim it does work with Linux, so I'm not faulting them for it. I took off one star so this review stands out for those who may have questions about compatibility. I kept it anyway because it may come in handy on a windows machine if I need to go headless, plus it was dirt cheap so the return is really not even worth the time to take it to Khol's or Whole Foods or the UPS store or wherever they'd make me bring it. I didn't personally test it on Windows but I can confirm that it did give me display options all the way up to 4k.For those wondering the issue I had is that the device seemed to "flicker" on and off like the OS was detecting the display again and again, It could theoretically be used in a pinch but for anything more than a few minutes this would be really annoying and block a lot of functionality.

These work well, as advertised. They are definitely a little pricier than other options, but they work exactly the way I expected them to. They are a firm fit in the port and don't wiggle or feel loose. Just plug it in and it just works! Very easy to use.

I bought these to CRD into laptops with damaged screens running Ubuntu 24. This does keep the machines from going to sleep with the lids closed, but the resolution is not 4k/UHD 3840 x 2160 (despite the machines also having that on their native monitors).Because this will be the output when the lid closes, this is the resolution you'll get when remoting in. You'll be messing with a lot of settings to get it to fit a regular monitor (with CRM/Ubuntu) instead of plug and play, so know that going in.