Review on CKL 4 Port KVM Switch Dual Monitor DisplayPort 4K 60Hz: Unprecedented Multi-Computer Control with Audio, USB 2.0 HUBS, and DP 1.2 by Alex May

My windows desktop (with 1 DP port worked fine) but my windows laptop (with 2 DP ports) initially showed no video on any of them. my monitors. After playing around with it for an hour or two, I found a sequence of steps that got both monitors working: turn off both monitors, restart the laptop, turn on one monitor, wait for the video to stabilize, then the other monitor turn on (in the correct order). But when I switched to my desktop, the (previously working) monitor went black. I couldn't wake it up without restarting the desktop PC. When I switched back to the laptop, both monitors went off and on again. Each flicker was accompanied by the standard Windows Found New Device alerts, which were immediately followed by the corresponding Lost Device alerts. The cycle then repeated itself endlessly. The only way I've found to stop the found-lost-found cycle is to turn off both monitors and then turn them back on one at a time with a minute or two delay between them. This is inconvenient - the windows I had previously maximized on my monitors had shrunk to the inner display panel of my laptop - so I sent the KVM back for a refund.