For what it’s worth, I can’t get any adapters to work on my ThinkPad and haven’t been able to resolve it for a long time. My only HDMI port is broken.

I’m going to try this with one of the Pi’s I have laying around. I’m excited to see if I can get it to work!

I'm excited as well to see if you can get it to work!

Since you mention Thinkpad, here is a personal pet peeve.

A company called StarTech makes ExpressCard devices and USB devices. They make:

* An ExpressCard HDMI capture device (no longer manufactured) that sits flush with the body of the Thinkpad. [0]

* ExpressCard USB3 peripherals that adds one or two USB ports to the Thinkpad and sits flush with the body of the Thinkpad. [1]

* USB3 to HDMI output devices that leave an unsightly dongle protruding from the Thinkpad. [2]

So, what StarTech does not make (and my pet peeve):

An ExpressCard device that adds an HDMI output port to a laptop and sits flush with the laptop's body.

Note that such a product would seem to be a trivial combination of their existing products. I would also expect that such a device would be cheaper to manufacture than the equivalent capture device.

[0] https://www.startech.com/en-us/audio-video-products/echdcap

[1] https://www.startech.com/en-us/cards-adapters/ecusb3s254f

[2] https://www.startech.com/en-us/display-video-adapters/usb32h...

Oddly enough, the comment seems to be a combination of comments of two different reddit accounts:

https://old.reddit.com/r/programming/comments/11r9osx/using_...

https://old.reddit.com/r/programming/comments/11r9osx/using_...

Yeah I noticed that. The "Lol" was not even in any of the original comments. Very odd indeed