I had two computers (home PC, and work laptop) set up and working nicely with a very inexpensive 2-port KVM switch box. It even worked OK with my Logitech unifying receiver.

Then I got a new work PC, and with it, a requirement to only use wired peripherals. I bought an inexpensive 4-port KVM switch, and all was well, until the new PC started misbehaving when I switched to it. The keyboard and mouse were simply not detected - and in fact when I tried plugging them directly into the new PC (bypassing the KVM) that wouldn't correct the issue - I had to reboot the PC, which fixed things until the next time it happened. This was intermittent but began happening more and more often, to the point where I had to give up on using the KVM switch (the monitor still goes through the switch).

It looks like something with full DDM (Dynamic Device Mapping) is the answer, as the attached PCs don't need to "rediscover" the peripherals each time. But most of the units for sale aren't all that clear on whether they truly have DDM, or just some near approximation. StarTech is bad about that, in particular ("FAST SWITCHING: Includes EDID and HDCP signal emulation "); ConnectPro has one that is less ambiguously described.

Both are spendy - the StarTech I'm looking at is about 500, the ConnectPro is about 580.


  • 3 computers (4, really, as there are no 3-port units)
  • Single monitor (second monitor output is not a requirement at this time)
  • Hotkey switching (don't want the hassle of a remote)
  • Cannot use a software-based solution
  • HDMI preferred but I could use adapters if the other features are met
  • Higher resolution (I have a double-wide monitor that goes to 3440x1440)
  • Audio passthrough is not a requirement
  • No other peripherals will need to be supported (though the ability to handle an advanced keyboard would be a plus).

Here's one that is a bit more affordable but says "semi DDM". Any idea as to whether that would do the job?

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