Live data from Hacker News

Two computers, one monitor, zero fiddling (2025)

alexplescan.com

101–110 of 153 posts

Re: Two computers, one monitor, zero fiddling (2025)

#101

Personally i prefer two computers, two monitors, one mouse/keyboard. Deskhop has been a lifesaver https://github.com/hrvach/deskhop

I had a setup like this back in 2000 using VNC, it always used to spin people out when they realised one of my monitors was a SPARCstation and the other was a WinME box. :D

Re: Two computers, one monitor, zero fiddling (2025)

#102
post #99

I solved the multi-computer-to-multi-monitor problem with a Level1Techs KVM[1]. The price (~$500 for the variant I purchased) initially gave me pause, but the longer I've had it, the happier I am with my decision. It handles all the switching at the hardware level and thus has no perceptible lag for video or anything else. I'm able to connect a single set of peripherals, in my case, two monitors, a keyboard, a trackb…

I wasted money on their KVM and it sucked for vfio stuff. Never again.

any details? considering this.

Re: Two computers, one monitor, zero fiddling (2025)

#103
post #48
post #5

Earlier quoted context omitted.

He bought a $900 monitor that has a KVM built in

~$900, and it takes ~3 seconds to switch... I'll pursue this when "they" decide to get real and make this not suck. Until then, I have sufficient alternatives. I appreciate the writeup. It convinces me that integrated KVM stuff ~~ except for fewer wires ~~ isn't much better than the mess that's prevailed for years now, and I'm not missing much.

I also have a $900 monitor (provided from work) which is also a built in kvm switch, and it can show two desktops, one HDMI/windows and one usb-c/mac, side by side or as an inset as well. There's no delay switching either.

It is supposed to hot-switch the inputs if I move the mouse to the edge, but it does not, I guess it's because one of them is HDMI.

I used to have a Lenovo dock that I used as a switch, but not anymore and there's definitely less clutter.

Re: Two computers, one monitor, zero fiddling (2025)

#104
post #99

Earlier quoted context omitted.

I wasted money on their KVM and it sucked for vfio stuff. Never again.

any details? considering this.

I would guess that there is an issue when the USB peripherals connect and disconnect as you switch inputs. I don't put USB drives in my KVM because it'll interrupt a transfer if switched.

Re: Two computers, one monitor, zero fiddling (2025)

#105

I solved the multi-computer-to-multi-monitor problem with a Level1Techs KVM[1]. The price (~$500 for the variant I purchased) initially gave me pause, but the longer I've had it, the happier I am with my decision. It handles all the switching at the hardware level and thus has no perceptible lag for video or anything else. I'm able to connect a single set of peripherals, in my case, two monitors, a keyboard, a trackb…

kvm usb switching is always broken, sometimes subtly, sometimes obvious

I use mechanical USB switches to individually switch USB lines like this:

https://www.amazon.com/dp/B01I0Y3GEE

one for keyboard, one for mouse

Problems it avoids

- cable speed usb

- no extra latency

- using boot-up hold-key-down sequences on macos works fine

- keyboard doesn't get hung in weird states

- no hotkey conflicts

- no mouse gets in weird state on one system that persists to another

etc etc etc

Re: Two computers, one monitor, zero fiddling (2025)

#106

I solved the multi-computer-to-multi-monitor problem with a Level1Techs KVM[1]. The price (~$500 for the variant I purchased) initially gave me pause, but the longer I've had it, the happier I am with my decision. It handles all the switching at the hardware level and thus has no perceptible lag for video or anything else. I'm able to connect a single set of peripherals, in my case, two monitors, a keyboard, a trackb…

I found KVMs to be annoying and settled on a USB switch and letting my monitor auto-switch inputs.

My mouse felt laggy under the KVM because of the high polling rate it wanted to use. Some key combinations also got added delay because of the way the KVM listened to shortcuts.

Instead of the $200 KVM a $20 alternative with a dedicated switching button did what I wanted in a much better way. Maybe if you need to switch back and forth more often a KVM would be alright? But at that point I guess dedicated monitors with the USB switch would still be better.

Re: Two computers, one monitor, zero fiddling (2025)

#107

I did something similar last year with a monitor without built-in KVM but with good DCC support (Ultrasharp U3417W) and Synergy [0]. I use Synergy as part of my desk setup already, but needed a way to view the UI of a normally headless machine. The solution I built was a small shell script that terminated the active Synergy session and started a new one with a different config file (so keyboard/mouse input would map…

I had one of the versions of this monitor and I miss the PIP and two displays half and half, the KVM, it was truly nice.I never had to move any wires. I wish there was one just like it but 120hz and higher brightness that’s not $1.5k

Re: Two computers, one monitor, zero fiddling (2025)

#108
post #19

What a great idea. It should be obvious and easy but DDC commands are hard to find and should be documented better. I have a Dell U4323QE in the office and look forward to trying this out. I wondered if it was the same DDC commands so I googled a little and found this gist (concerning DDM): https://gist.github.com/nebriv/cb934a3b702346c5988f2aba5ee39... Which has the very useful comment: https://gist.github.com/nebri…

There is a myriad of apps that handle all the DDC commands for you, it’s a non issue unless you want to write something custom.

Re: Two computers, one monitor, zero fiddling (2025)

#109
Honestly the best thing that worked for me, even if the hardware is not for everyone, is a Logitech MX Keys that supports 3 devices paired with another Logitech mouse that supports 3 devices, then flip the monitor through the inputs, super reliable. I could even have 2 devices side by side on the same screen (Dell utlrawide) and toggle between them.

Re: Two computers, one monitor, zero fiddling (2025)

#110
Thank you! I hadn't thought of using software to handle monitor switching.. I have a very similar setup but my monitor doesn't support usb upstream so I have a dumb usb hub with a button to switch sources then still have to manually use monitor input change.

You gave me the idea to setup scripts on the windows / macos system to 'react' to hub detach events (which I click the button) and execute cli commands to change the monitor source automatically to the other machine. Too good.

Post reply on HN