I recently switched from a Filco Majestouch 2 keyboard to a Ducky one (I wanted to go TKL). The ducky, however, does not appear to work in the usb hid port on the Level 1 tech KVM.
Is there perhaps some kind of firmware update or something I could try on the KVM? It is not unusable like this, I just plugged the kvm into the front usb-3 port, but it’s a bit of a bummer 
Thanks!
I was thinking maybe a firmware update for the KVM, the keyboard works fine
If you disable nkey rollover the kvm will work fine too. Reason it doesn’t work is because the leading keys and actual keys come from different hid endpoints. Not an issue I can really fix from my end. Nkey on qmk can be fine if you customize it slightly not to send the kvm leading keys from a different hid endpoint. There’s a thread on here that has the qmk setup to do that
Bleh, there’s no QMK (yet) for the Ducky One IiI, I probably should have checked that. Disabling nkey does seem to work, perhaps it’s a tradeoff worth making to get the screen switching back.
How many key rollover does the KVM support? I think USB HID has like 3 different protocols for this?
It’s not a protocol. Understand what’s happening. Nkey rollover makes one keyboard show up as 3 or 4 on the bus. The key events come from different what appear to USB to be physical key boards.
6key is literally the designed USB limitation, nkey is a hacky work around implemented slightly differently on damn near every keyboard that has it hence the jank.
Qmk has a more reasonable approach,and is more flexible. 6key is not likey to be functionally different for you than nkey anyway
Ok so my next keyboard will be VIA/QMK. 
I am currently on a Ducky keyboard as well.
I thought that was only in the boot protocol? I saw a video of Ben Eater I believe hooking up a scope to a usb hid keyboard showing that there were multiple protocols for the various key rollover. The packet format was different for nkey vs the 6 key one.
Maybe I totally misunderstood things, but wikipedia also seems to agree with that? Does the KVM only support the boot protocol?
No because then things like the 8 vs 20 byte protocol of Logitech wouldn’t work. Which does work.
I’ll hook up a scope between the ducky and the KVM and report back as to what is actually happening. I have some suspicions but I don’t know anything right now.