I ended up getting a KVM in the middle - it’s more cables but I have a 144Hz gsync screen and I can easily swap kB+m+screen with a dedicated, hardware button
What KVM are you using that has gsync and 144Hz support? I couldn't find one last time I looked. I'm running an Alienware 3418DW and have video switching through the monitor and a separate USB 3.0 switch.
I wondered that too, maybe he is routing everything through usb-c and uses a usb-c hub?
Conventional KVMs have VGA, I doubt he uses it. Maybe he has an HDMI one.
I've got a 4k display and finding a KVM that supports 4k 60hz is nearly impossible where I live. I plan on using a regular KVM to share mouse and keyboard via USB and use my monitors second input for manually switching between PCs.
It's a two step solution but at least doesn't break the bank.
4k has been a source of lot of frustration for me. Regular adapters don't work, regular cables don't work, you can't find content. HiDpi scaling is not that great.
I feel like an early adopter. Everything is a hassle, parts are expensive.
I had a 1080p 32 inch monitor once, it was great but the resolution was lacking. I replaced it with a 32 inch 4K one, but I couldn't get the same experience.
You can use a passive displayport switcher. I have the Alienware 3420DW and just got this (https://www.newegg.com/p/183-0075-00026?Item=9SIAEKBBMV2800). The monitor is DP 1.2 so 120Hz @ 3440p with gsync and it all passes through the switcher without issue. My setup now has a USB 2.0 switcher for keyboard/mouse/headphones and the DP switcher for graphics both ziptied to a display post. That way switching machines is two button presses. Much better than a KVM IMHO that will likely go absolute next monitor upgrade.
Level1Techs sells a few KVMs that can do it but they're not cheap