barrier VS synergy-core

For software KVM you can use https://github.com/debauchee/barrier

I use it between a Windows PC & a Macbookpro (Linux version available but I don't have Linux)

libei looks useful. But IDK why libei is necessary to run Barrier with Wayland?

For client systems, couldn't there just be a virtual /dev/inputXYZ that Barrier forwards events through

And for host systems, it looks like xev only logs input events when the window is focused.

Is xeyes still broken on Wayland, and how to fix it so that it would work with Barrier?

With Barrier, when the mouse cursor reaches a screen boundary, the keyboard and mouse input are then passed to a different X session on another box until the cursor again crosses a screen boundary rule.

Barrier is a fork of Synergy's open core: https://github.com/debauchee/barrier

libei:

I have a similar gaming/WFH setup (2 monitors at 1440p 144hz) and I’ve been using Barrier instead of a physical kvm, and it works really well. Not sure if you’re open to a software kvm but if you are, I’m happy to answer any questions about it if you have any.

Have you tried Barrier? I casually used it to swap between my main rig and my MBP. Took a minute to get it setup but once I sorted it all out it worked pretty well. It has some settings and tweaks built in to address some of the layout issues you mentioned...

Barrier appears to handle PC switching only for the keyboard and mouse.

Sorry, probably not entirely on topic and can't answer anything reliable about the multimonitor stuff, but a tip regarding the 2 mice and 2 keyboards for the 2 different computers: use this: https://github.com/debauchee/barrier It's oss multi-os software that lets you use one mouse and keyboard (server) on several PCs (clients) easily over your LAN.

Barrier is a free and open source alternative.

No one has mentioned ShareMouse yet? (https://www.sharemouse.com/) In my experience it has worked way better than Synergy. I switched after getting fed up with the synergy developers not responding to various multi-year old bugs that made the software unworkable for me (e.g. https://github.com/symless/synergy-core/issues/5992).

The only downside is that you have to "renew maintenance" to continue receiving updates to ShareMouse after a year. But I haven't done that yet and it still works fine for me.

I want to be able to do things like Synergy, Steam Link, Unified Remote, and Media Servers between any of these devices, with as little added latency as possible (especially important for steam link)

i've got several fedora linux machines running and sharing their monitors via synergy (https://symless.com/synergy) , all controlled by the keyboard/mouse on the primary synergy server.

Not sure if this is what you're asking, but I've been using Synergy Pro (Windows, macOS, Linux) for years, and it works seamlessly. It lets you share your mouse and keyboard across multiple systems (with or w/o encryption), copy and paste between computers, etc.

I've got an M2 MacBook Air

Per the Advanced... screen under Displays in System Settings, you can link to a Mac or iPad to control it a la Synergy[0]

I have not done it myself, but I do not see why you could not do it with a current-gen Mac Mini

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[0] https://symless.com/synergy

I previously used a software solution to do the same thing and it was actually really good, better even. It might have been this software but I have to check to be sure - https://symless.com/synergy - as I’m not at my laptop right now.