Review on 🔁 CKLau 4Kx2K@60Hz 4:4:4 DP Displayport KVM Switch 4 Port - Includes Cables, Audio, and Microphone by Ruben Jamrock

Build quality seems good, case is metal, wires are all pretty thick. However, it doesn't work properly. I have a new LG 4k 27" monitor and two computers (Windows 10 and Ubuntu 18.04). Both work fine with a direct attached monitor, so I know systems can handle high resolutions. .Here is the behavior so far: Windows: Windows boot animation is visible, then nothing, no image, just black screen, KVM boots and runs fine, however when I press the switch and then switch back the resolution drops to 800x600 and the screen is not recognized properly need to remove and reinstall the DP cable at the end of the graphics card.If any of the vendors can answer I'd appreciate it.