CKL KVM Switch Dual Monitor HDMI 4K@60Hz (2 Monitors 4 Computers 942HUA-3) for Home and Office to Console Desktops/Laptops, Support USB 3.0, Hot Key, Audio, Wireless Keyboard and Mouse

The multiple displays work great! But, the mouse and keyboard sharing gave me trouble from the very beginning. I originally thought it was software related, something that I may or may not have installed on my PC. I continued to troubleshoot from a software perspective, for months, only to recently realize that it was this switch! When plugged into the switch, the mouse was recognized by the laptop, but every once in awhile, the mouse pointer just started jumping around the screen, or as I typed, it would open various apps, as if I've clicked on one of those apps. I experienced the Windows "Blue screen of death" many, many, many times since purchasing the switch. After writing a scathing, bad review, the manufacturer reached out to me. When I explained what had been happening, and that I was at my wits end, support mentioned that there was a "Hot Key" button on the front of the device, and asked whether it was on or off. I told them that I had never messed with this button, but that it was on. They told me that if this button was on, with certain keyboards and mice, it could cause such issues. I switched off the "Hot Key" button, and both the mouse and keyboard immediately started to work. After about 2 weeks now, with the "Hot Key" button off, I can happily say that I no longer have the "bouncing" mouse, the keyboard is now working as intended, and I have not had a single crash or blue screen of death, since turning it off. I wanted to rewrite my negative review, and turn it into a positive review. I really wish I had reached out to the manufacturer support team earlier. I could have saved a lot of hair, and my hair would probably still be a dark brown. ))) Knowing what I know now, I'm ashamed to say that it was operator error. This seems to be an excellent 4-port KVM switch.

The short story is, it works. It's finnicky and has a couple of warts. But, if you need a dual-monitor HDMI KVM and have some patience (and the right parts), you'll very likely be able to get it to work and be pleased with it. The longer story is, out of the box I had a couple of problems and came very close to returning it. The first problem was, one of my monitors was a DVI monitor. I connected it to the KVM using an HDMI-to-DVI cable (not a DVI cable with an adapter). When I switched between computers, the screen would look fine for one second and then turn to colorful static. Both the monitor and the cable worked fine without the KVM, but I tried a different cable anyway. No use, didn't work, same behavior. The second problem was, my PC has two video ports, HDMI and Display Port. The KVM detected the signal from the HDMI port fine, but not the Display Port. Again, I used a cable (HDMI to Display Port) without an adapter that worked fine without the KVM. So, I boxed it back up and requested a return label from Amazon. A couple of days later, before dropping the box off for return, I decided to try again. I bought an HDMI monitor to replace the DVI monitor and then did some research into the Display Port problem. Turns out, I needed an active Display Port adapter with an HDMI cable. The Display Port to HDMI cable I had was passive. (And if you don't know what this means, I didn't either.) A week later, with the new parts in hand, I hooked everything up and it all worked fine. Also worth mentioning, one of the computers hooked up to this is a MacBook with a USB-C to HDMI cable, which works fine, no adapter needed. As for the warts, there are two. The first is, it doesn't come with a power adapter. It comes with a USB to power plug cable, but you need your own USB charger. (I used the one that came with my Roku because that device is plugged directly into the USB port on the TV.) This is a $300 KVM. For that price it should definitely come with a power adapter. The second wart is, it needs to be power cycled about once a week. What happens is, my mouse still works fine, but my keyboard (Redragon wired keyboard) stops working (though, it still draws power and the RGB lights stay on). Luckily, the KVM has a power switch on the back. So, I just need to turn it off, count to ten, and turn it back on. (Of course, the computer thinks the monitors have been unplugged, so all the windows on all the connected computers get moved around and resized.) I'll also mention, my mouse is a wireless Logitech M570, which works perfectly when the receiver is plugged into the mouse port on the KVM. I purchased this KVM to replace an IO Gear single-monitor DVI KVM. Wireless receivers do not work in the mouse port on that KVM, so there's another plus for this one. If you do purchase this and need to attach it to Display Port, here's the adapter that worked for me: https://smile.amazon.com/gp/product/B00S0C7QO8/ref=ppx_yo_dt_b_asin_title_o07_s00?ie=UTF8&psc=1

Works great for my two windows and one Mac. It came with only USB cables so I had to buy HDMI cables separately but its reasonable for the price. Switching is also reasonable (for me about 3 to 4 seconds, I would have liked near-instantaneous like 1 to 2 seconds but its still good for me). All in all its a great product.

I bought this KVM to replace my old Belkin SOHO after it stopped working. The other review notes about the poor quality cables are true. I had one cable DOA out of the box and I am getting flakey performance from some of the other cables. Other than the cables the KVM performs decently for office work, the biggest issue is when I switch to my gaming PC. I get keyboard ghosting(missed key strokes) and ignored mouse inputs. I don't know if the issue is lag or poor internal quality, but I bought this since my office is dual business/gaming and it definitely does not work in that role. Update: While playing around with this switch I moved my keyboard from the USB port specified on the KVM for keyboard to one of the generic USB 3.0 ports in the front and that resolved my keyboard ghosting and mouse input issue so I am updating my review from 1 star to 3 stars. I am still docking two stars because for $250 I shouldn't have to deal with input issues or faulty cables. 3 Year UPDATE: I am dropping my review back to 1 star. This KVM requires me to now turn it off and on every other day even to function. The Keyboard and mouse "pass through" ports have so much lag I have to use the USB hub if I even want to have any hope of playing a game without tearing my hair out. This thing just sucks, buy another brand, learn from my $240 mistake.

In the pretty limited world of 4 workstation KVMs (most are 2 workstation), this one has worked decently for me. Every once in a while the peripherals don't register when switching over and you just have to click back and forth once. I've had the the monitors occasionally not register as active on one port, but working for others. Unplugged and replugged has always solved those issues. Support is pretty responsive though. Both times I emailed, they got back to me in 24 hours or less with what to try. Neither ultimately fixed the issues, but both issues are pretty small (to me) and aren't bad enough for me to return the product anytime soon. For what it costs, I would hope it worked more consistently, however I realize most people probably don't have 4 workstations to swap between, so the market for these is pretty small. This one does have a small form factor, which is one of the reasons I went with it over the other option on Amazon. Overall, I'm content with this device. I would tell someone what I use if asked, but I probably won't be asked to be the brand ambassador any time soon.

I currently run 4 computers, two running Windows, one running Linux (Mint Cinnamon) and one Mac. My previous setup was to have each one with it's own monitor(s) using a bluetooth keyboard and mouse to switch back and forth. With 6 monitors and all the laptops open my desk was a very cluttered. With this switch I now have just the two monitors and the laptops, freeing up a lot of space on my desk while still allowing each to have a three monitor setup. Setup was very simple, with Windows and Linux being plug and play, Mac requiring a little more tweaking but still easy enough. Switching the peripherals between computers is very quick, the keyboard and mouse are ready to go within a second, and the monitors switch over in about 2-3 seconds. My favorite part of all this is that each computer stills register that the external monitors are plugged in even when the switch isn't set to it, so when I switch back all my windows remain where I left them.

I have zero complaints thus far. I already own a CKL 2x2 USB 2.0 KVM so I knew what I was getting myself into when I bought this model to accommodate a new Macbook Pro. The previous USB 2.0 KVM I had was okay but I had a slew of issues with USB peripherals, particularly my webcam. The USB 2.0 model only has three USB ports, so I had to use a hub to connect my headset and webcam. This tended to overload the port and constantly cause disconnections. This is no longer an issue with the USB 3.0 model, which has four USB ports. I currently only have three computers hooked up: 1. Desktop (one HDMI and one HDMI to Displayport) 2. Lenovo Thinkpad Yoga X1 with Thunderbolt 3 dock (one HDMI and one HDMI to Displayport) 3. Macbook Pro 2018 with iVANKY 12 in 2 dock (two HDMIs) The audio was initially finicky, but I figured it out. You just need to make sure you have a monitor that can output audio, make sure this monitor is Monitor A, and set your computer's audio to this monitor. No problems after that. I don't use hotkeys as I find the wired remote easier to use for my set up. I took one star off because every now and then, when I switch to the Macbook, I get static on one monitor. I have to unplug the Mac dock and plug it back in. I can't tell if this is an issue with the dock or the switch but it never happened with the dock before.

I bought the most expensive 4 computer KVM that I found on Amazon because I wanted one that was up to date and likely to work. I have 3 Windows computers and 1 Linux computer attached to the switch. The switch supports two monitors, but I only use one. I had some difficulty getting the Linux computer to connect. Unlike the Windows computers, the Linux one only works if the switch is set to that computer when it goes through the boot process. Then it works quite well. There is a slight delay of a couple of seconds when switching, which is hardly noticeable. The switch is powered by a USB cable, so it needs a USB to be on before the switch turns on. I have mine connected to my router and it works. When I had trouble getting the Linux computer to connect, I sent an email to "support." I received a prompt reply. After two emails, the switch was working.