Using a Raspberry Pi to add a second HDMI port to a laptop

Re:Using a Raspberry Pi to add a second HDMI port to a laptop by ar9av on Wednesday March 15, 2023 @10:05AM (#35168515)

Why would you need to do this? USB to HDMI adapters exist and now that USB-C is mainstream there are adapters for that too and significantly cheaper than a raspberry pi. One use I would like to see is a pi convert an HDMI signal to ethernet and convert it on the other side with a second pi.

Lol basically any DisplayLink adapter would work. Way cheaper.

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Re:Using a Raspberry Pi to add a second HDMI port to a laptop by pcouy on Wednesday March 15, 2023 @10:17AM (#35168662)

Lol this is copy pasted from a comment on reddit...

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Re:Using a Raspberry Pi to add a second HDMI port to a laptop by coreyisthename on Wednesday March 15, 2023 @10:26AM (#35168781)

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!

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Re:Using a Raspberry Pi to add a second HDMI port to a laptop by pcouy on Wednesday March 15, 2023 @10:39AM (#35168959)

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

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Re:Using a Raspberry Pi to add a second HDMI port to a laptop by RunSet on Thursday March 16, 2023 @09:39AM (#35181818)

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...

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Re:Using a Raspberry Pi to add a second HDMI port to a laptop by johndough on Wednesday March 15, 2023 @11:10AM (#35169509)

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_...

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Re:Using a Raspberry Pi to add a second HDMI port to a laptop by pcouy on Wednesday March 15, 2023 @11:47AM (#35170112)

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

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Re:Using a Raspberry Pi to add a second HDMI port to a laptop by johndough on Wednesday March 15, 2023 @10:55AM (#35169275)

I bought one of those USB-C to HDMI adapters just to find out that the USB-C ports of my desktop computer, my laptop and my phone do not support HDMI over USB-C.

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Re:Using a Raspberry Pi to add a second HDMI port to a laptop by MayeulC on Wednesday March 15, 2023 @11:31AM (#35169859)

Some devices only have DisplayPort alternate mode output, so may need a cable (or adapter) that does the DP->HDMI conversion. Assuming your devices support DP Alt. mode. These are active adapters.

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Re:Using a Raspberry Pi to add a second HDMI port to a laptop by justinsaccount on Wednesday March 15, 2023 @11:06AM (#35169446)

USB-C to HDMI adapters are not the same as display link.

DisplayLink is a janky proprietary virtual framebuffer thing that is pretty similar to the linked project.

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Re:Using a Raspberry Pi to add a second HDMI port to a laptop by pcouy on Wednesday March 15, 2023 @12:48PM (#35171081)

Same situation I was in with my new laptop, except that I already had USB C docks lying aroud

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