this post was submitted on 08 Feb 2025
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There are plenty of portable second screens for laptops now. But it seems weird you can't just hardwire a second laptop without having to resort to internet based screen sharing solutions.
if you're saying what i think you're saying you may be interested in something like a nexdock
Basically a laptop with no internals that acts as an external monitor, battery bank and peripherals for another device
some cheap all-in-ones i've worked on have hdmi in and out.
one of 'em i have here is an old atom celeron dell aio with 1600x900 native screen but on its hdmi input, it'll run at 1920x1080. and yea, running that instead of its true native res sucks about as bad as you think it would--but it is still 'usable'. the real sucky bit, though, is the pc has to be on in order to switch it to hdmi in.
a lenovo aio that went through here a couple years ago had to be rebooted to switch it from hdmi input mode (acting as a standalone monitor) back to pc.