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Update multiport.md (#331) 
* Update multiport.md

Added solution for the HDMI back power - Just found out about it

* Update multiport.md

Added link for the hdmi splitter
2021-06-05 23:32:35 +03:00

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Multiport KVM over IP

There are many ways to do this, but the best and most documented one right now is to use the ezCoo KVM switch.

Also, Pi-KVM can be connected to a multi-port HDMI/USB switch and the switch's buttons can be connected via optocouplers to the Pi's GPIO to switch channels.

If your KVM switches channels using keyboard shortcuts, there is a chance that it will not be able to work with OTG (v2 platform, see below), since it does not fully implement the USB stack. In this case, you will have to use an Arduino board to emulate the keyboard & mouse (Pi-KVM supports this configuration).

❗WARNING❗ - AiMOS has a back powering issue that makes the Pi behave differently, there is a work around here

List of tested KVMs

Here the status is:

  • ✔ - Everything is working as expected. There may be some subtleties.
  • ☹ - The switch does not work with OTG (v2) and requires an Arduino HID or soldering GPIO to switch channels or something like that.
  • ✘ - The keyboard or mouse does not work at all, the switch loses the image, etc.
Model Status Notes
ezCoo EZ-SW41HA-KVMU3L 4x1 switch ezCoo SW41HA HDMI 4x1 switch (legacy) ✔ Using with Pi-KVM
Ali's noname ✔ Limitations are are listed below See here for some additional details
Aimos 8-port HDMI USB-C KVM Switch ✔ Similar to Ali's noname model, available in 4/8port editions, has same HDMI bridge boot problem/solution using a Marmitek 312 UHD HDMI splitter. Limitations are are listed below See here for some additional details
TESmart 8 PORT - HDMI KVM SWITCH ✔ Use OTG with USB 2.0 Hub only, no hotkey support. Switching available with serial or IP-to-serial interface using fixed IP (/31 peer-to-peer addressing supported). Can be managed via WebUI or CLI tool

Limitations:

  • HDMI backpower needs to be mitigated - Cheap 13$ HDMI splitter will work
  • MSD work around is needed as it will not work OOB
    • Solutions
      • Solution 1: RPi4 OTG needs to be in the KB port for mouse and KB funtionality, ZeroW is required and needs to be connected to the HUB port for HK switching and MSD functionality - ✔KNOWN WORKING✔
      • Solution 2: Aurduino is needed (WIP) - Please report in the channel that this solution works for you