OPEN BOX - Tripp Lite 4 Port DisplayPort USB KVM Switch, Quad Port DP USB KVM Switch, 4K 60 Hz, HDR, HDCP 2.2, DP 1.4, USB 3.0 Cables, Black (B005-DPUA4) 4-Port DisplayPort

I've been using this product for several months, and without fail, any time one of my Windows systems has to be restarted, so does the KVM. This is especially true on Windows 11. I mainly toggle between two systems, one on Windows 10 and one on Windows 11. The Windows 10 PC gets shut down whenever I'm not using it, and the Windows 11 PC generally stays on all the time, unless there's an update that requires it to be restarted. EVERY TIME I have to restart the Windows 11 PC, I have to fight with this KVM switch, cycling it on and off and on again just to get Windows 11 to display on my screen. The Windows 10 machine has similar issues, but it usually works after one restart. The only reason I gave this two stars is because I know this is a Windows issue, but consumer support for this product is basically non-existent, and there is no discernable way to install drivers or update firmware on this device. When it works, it works as it's supposed to, but it shouldn't fail this frequently, or for this dumb of a reason.

I bought this KVM in January 2021 to upgrade from a previously IOGear DVI KVM, with the goal of getting higher quality video passed through on native DisplayPort. For keyboard, video and mouse, this KVM is absolutely fantastic. I can easily run 1920x1080 (highest my monitor supports) @ 144mhz over DisplayPort connections. If you aren't a fan of mouse emulation you can plug a mouse into one of the front USB ports. I don't rely on my KVM being a USB hub, so this isn't a big deal to me. As others have noted, it does not keep active video signals from non-primary inputs running. So if you use two monitor setups, it might have some screen hitchery when you switch back and forth (also not a big deal to me). This one would be nice if TrippLite could make a firmware update to fix though. The *only* bad thing I have to say about this KVM is that the audio pass-through is quite horrific. Unless you only a headset, any speakers hooked up to the OUTPUT 3.5mm jack will have an overpowering whine/hum that drowns out the audio almost completely. You can hear the audio faintly but it is very quiet behind the hum. I tried with many different powered speakers from 5.1, 3.1 and 2.0 setups. It isn't speakers or a shielded wiring issue. If you even only plug AC power into the KVM, power it on, and plug any speaker set into OUTPUT audio, the issue is present. I similarly tested running audio through a ground loop isolator adapter for 3.5mm with mixed results. That *helps* to clear the audio for the most part, but it is still quite "boomy/static-y" with bass-intensive audio. I have an open case with TrippLite about this, but I don't expect anything soon as this is likely a hardware issue internal to the KVM. The difficulty is that it is hard to find both moderately priced and moderate quality DisplayPort KVMs. There might be better quality ones by IOGear and Belkin and the like, but the prices more than double. If you don't mind the audio issues, or don't mind using a headset/adapter/separate audio switcher, I would recommend this item. If TrippLite releases any newer or fixed model with fixes for audio, I'd happily upgrade this to 5 stars. I ended up bypassing the KVM audio altogether with an inexpensive audio switcher that worked perfectly (no channel cross-talk or audio bleed that I can hear): https://www.amazon.com/gp/product/B07DNYF22N/ref=ppx_yo_dt_b_asin_title_o03_s01?ie=UTF8&psc=1

Works great for my 120hz ultrawide monitor. with 2 windows PCs and 2 Mac Laptops. It is not perfect, but if you set it up right it is solid. * If I plug the mac laptops directly in to the KVM they re-arrange everything when I switch to and from them which takes a while and is pretty annoying. To get around this, you can use a device like the DP REPEATER that level1techs sells. It basically fools your mac into thinking the display is still connected when you switch away and makes the switching fast. * YOU MUST USE GOOD CABLES. I originally used the Displayport cable that came with my monitor and it didn't work well at all. The screen kept switching to black. I swapped out the cables and it now works great. * Don't try to use the keyboard and mouse ports. Only use the USB ports on the front. The problem as other have mentioned is that the mouse port switches when you get to the edge of the screen and is super annoying. I only switch using the remote that comes with the KVM. Also, gaming keyboard don't work well when plugged in to the keyboard port. I tried a more expensive KVM from ConnectPro first and it was terrible. I'm quite happy with this one from Tripp LIte.

I like that the switching is smooth between the 2 pcs and 2 laptops I have for home and work, however when I have it set for my gaming pc, the screen occasionally turns dark, and won't sync for up to a minute. So now I have the 4 pcs connected for the keyboard and mouse, but the gaming pc is connected to the second input port of the monitor.

For the price of this KVM, I was expecting a whole lot more. I have multiple switches to run my multi-monitor setup (2 laptops, 2 desktops, three monitors). When I added the third screen I decided to go with a Display Port switch instead of HDMI - in part because my monitor has better support for DP and all of my systems have DP outs which I was having to use DP to HDMI converters. I chose this particular KVM because of the DP 1.4 support and being able to do 4k @ 60Hz. Many of the other 4K KVMs out there only do 30Hz. After getting everything connected, I was very disappointed. I was expecting a much more modern KVM, but instead found this KVM has many of the flaws found in older KVMs. Here's a list of issues I came across: - I use a wireless keyboard/mouse combo. On my HDMI KVM that's no problem, but with this KVM plugging the wireless usb adapter into the keyboard or mouse usb port gives me hotkeys, but the scroll wheel does not work and mouse movement is erratic. Using the front usb port fixes the mouse (movement and wheel), but then you lose hotkey switching. Then I found that after switching I would lose keyboard and mouse and would have to un-plug/re-plug if using the front usb port. - When switching, the other computers are disconnected from the display. Unlike my HDMI switch, this one does not maintain a signal back to the computer. This makes switching take longer and if you have a multi-monitor setup, it messes that up (at least in Windows) because the number of displays changes. Due to these behaviors I have gone back to an HDMI switch for my primary display and only use this one for one of my monitors that doesn't get switched often. I may reach out to TrippLite to see if they plan to offer a firmware update that would modernize this KVM, but I'm not holding my breath...