U3219Q, KVM stopped working

Question

I have a U3219Q that I have connected to a custom desktop PC and a Dell Latitude Laptop. I purchased the monitor in July 2020 and up until now it has mostly been a flawless experience. A few times in the past, and now currently, the KVM feature of the U3219Q does not pass keyboard or mouse to the laptop. I still get video from the laptop. Keys and mouse and video all work fine when I switch to the desktop. In the past, some combination of unplugging the laptop, powering down, restarting, etc. would cause the feature to begin working again. I never really paid attention to what fixed it because it's happened maybe 3 times in the past 5 months and not at all recently and I can't even say for sure that the same thing fixed it every time. But I could get it working again within a few minutes. But at this point, nothing I do will cause it to begin working again, including- power down monitor, unplug everything including power, hold power button for 8 seconds, reconnect, repower- factory reset of monitor- unplug/replug USB-C from laptop- unplug/replug Display Port from laptop- restart laptop- power down everything and bring only laptop and monitor up * PC modelDell Latitude E7470 laptop (problem) and custom-built desktop PC (not a problem) * Operating systemWindows 10, 1809 (laptop) * Video card specifications (video out ports)Windows says the laptop has Intel HD Graphics 520. I have the laptop on a docking station and the video is going to the monitor via the DisplayPort on the docking station. When the monitor is displaying the DP, I have 'USB Selection' setting as USB Type-C. And there is in fact a USB Type-C to USB cable running from the monitor to the docking station. The desktop, which is working in all cases, is connected on HDMI and USB. FWIW, it has a Radeon RX 5700 XT card. Like I say, this had been working 99% of the time. It was working earlier this morning, but when I switched back to the laptop from the desktop, the mouse and keys were no longer working. I can switch back to the desktop (using the source select button on the monitor) and the mouse and keys work fine. This was the primary reason that I settled on this particular model and now it isn't working. Help!

Jurld · Accepted Answer

I've gotten the KVM working again by turning the laptop off, unplugging it from the docking station, powering off the docking station, then reconnecting and repowering both.

Maybe I will remember that if/when this happens again a few months from now?

DELL-Cares · Answer

Glad you got it working. I don't have any further recommendations at this time. ^JKC

Monitors

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