I'm currently looking for a KVM that supports two monitors with a resolution of 2560 × 1440 and has DDM or at least Semi-DDM for input devices.
DVI ist not an option, even if Dual-Layer is supported, as one of the connected devices will be a laptop with only USB-C and that cannot reasonably converted into dual-layer DVI. MST support on the output side (input needs to be two seperate displayport cables, as one of the devices does not have MST) would be nice for cleaner cable management, however two seperate DisplayPorts would also work.
DDM is mandatory though, as emulation does not work for me (gaming mouse & keyboard) and simple pass-through is too slow (full enumeration needed every time I switch).
Please do not suggest software solutions. I know they exist (even though there's only one or two that do KVM and not only KM), but they need always need the master device to be running, which is not something I'm willing to do.
41 Answer
The only KVM's with DisplayPorts and DDM that I've found are from ConnectPro. They also support two monitors, available in two versions, one with two and one with four input ports (DP and USB).
Unfortunately they are not available yet. The weird thing is that they have been on the site since about a year now. I wonder if they will ever be available.
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