I am using this one with an older Mac mini and my laptop: KVM Switch HDMI 2 Port Box,ABLEWE USB and HDMI Switch for 2 Computers Share Keyboard Mouse Printer and one HD Monitor,Support UHD 4K@60Hz,with 2 USB C

Have you confirmed that this KVM can handle a >1080p signal?

Yes, up to 4K @ 60hz link

What video card are you using?

Radeon RX 580 (has Dual Link DVI, 2 HDMI, 2 Display Ports)

Thanks for the product suggestion. Link I mentioned, I've tried two other active adapters with no luck. Those both had an extra USB wire hanging off, presumably for power. The one you suggested is different, so I'll give it a shot.