Macbook Pro M4 with Caldigit TS4 - KVM HID issue, cannot use mouse and keyboard

Level1 Store KVM Helpdesk
1

KVM Model:

PAAG-ET3122B

USB Interface (5-gigabit or 10-gigbit)

10 gigabit

Problem:

Macbook Pro M4 with Caldigit TS4 - KVM HID issue, cannot use mouse and keyboard

Other Notes:

  • the usc c cable is connected to the Caldigit TS4 thunderbolt 4 port as illustrated in the FAQ.
  • the usb c cable is connected to the kvm on the (Data Only) port
  • I have tried several different usb c cables with the same result
  • the Caldigit TS4 is running the latest firmware
  • the Caldigit TS4 setup does work with a Dell laptop running Linux
  • HIDs are:
    • Microsoft ergonomic keyboard - USB
    • Logitech M720 Triathlon Mouse - Bluetooth USB dongle
    • Plantronic Headset - Bluetooth USB dongle

Thanks in advance!

2

Are you sure you’re using the dedicated downstream port?

Screenshot from 2026-05-11 17-17-30
Screenshot from 2026-05-11 17-17-301416×491 84.3 KB

3

@Level1_Amber , I am using one of the Caldigit Thunderbolt 4 ports (15W) to connect to the KVM.

I found that by connecting the keyboard and mouse into the USB 3.2 ports on the front and rear that I can make the mouse and keyboard work.

I was able to use a usb hub plugged into the USB 3.2 ports and all three hid devices worked with the kvm and my MAC.

I did try all of the devices in all four HID ports, but no joy.

I found another forum post where the the usb 3.2 ports were used to solve a keyboard issue.

Level1Techs forum user solved the problem this way as well.

I will continue to monitor this and other threads to see if there are other solutions to try.

Thanks,

GregT

4

Some peripherals are not compatible in the USB-HID ports, or a problematic device has caused the HID stack to crash.

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