Ответ нашёлся тут:
USB keyboard protocol is limited to 6 keys pressed simultaneously + 3 modifier keys. To bypass this limitation, some keyboards report to the computer as a USB hub with multiple keyboards connected to it.
If your KVM switch was just directly passing through its USB port to the active computer, it would work fine, but this approach has two disadvantages:
You can't switch computers using keyboard shortcuts because the KVM doesn't interact with the keyboard, or whatever else is connected to USB.
Switching between computers disconnects USB device from one computer and connects it to the other. This will trigger USB (dis)connection sounds and may cause a short delay until devices start working after the switch.
To solve these problems, switches take over keyboard communication and pretend to be a permanently connected keyboard for each computer. Keystrokes are passed through to active computer or intercepted if they're recognized by the KVM as a special command.
For this feature to work, the connected device must actually be a keyboard - KVM doesn't implement complete USB protocol including hub support. So if the keyboard reports as a hub, the KVM may not know what to do with it.
If your KVM switch was just directly passing through its USB port to the active computer, it would work fine, but this approach has two disadvantages:
You can't switch computers using keyboard shortcuts because the KVM doesn't interact with the keyboard, or whatever else is connected to USB.
Switching between computers disconnects USB device from one computer and connects it to the other. This will trigger USB (dis)connection sounds and may cause a short delay until devices start working after the switch.
To solve these problems, switches take over keyboard communication and pretend to be a permanently connected keyboard for each computer. Keystrokes are passed through to active computer or intercepted if they're recognized by the KVM as a special command.
For this feature to work, the connected device must actually be a keyboard - KVM doesn't implement complete USB protocol including hub support. So if the keyboard reports as a hub, the KVM may not know what to do with it.
Ратнер Арсений, arsenyratner@gmail.com, 7 985 273 2090
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