How to make a Debian 13 GNOME appear as a display to another Debian 13 GNOME connected to the former via USB-C on both ends?
Apr 6, 2:10pm

To make a Debian 13 GNOME system appear as a display to another Debian 13 GNOME system connected via USB-C on both ends, you need to use the USB-C port in DisplayPort Alt Mode. This allows the USB-C cable to carry video signals between the two computers.

Key Requirements & Steps

1. Hardware Support

  • Both computers must have USB-C ports that support DisplayPort Alt Mode (not all USB-C ports do).
  • You must use a USB-C cable that supports video (look for "DisplayPort Alt Mode" or "Thunderbolt" in the cable specs).

2. Software Setup

  • GNOME Remote Desktop (Wayland) can be used to share the display, but it requires both systems to be set up for remote access.
  • Alternatively, use Barrier or Synergy for mouse/keyboard sharing, but this does not provide video input.

3. GNOME Remote Desktop (Wayland)

  • On the target machine (the one you want to use as a display), enable Remote Desktop:
    • Go to Settings > Sharing > Remote Desktop and enable it.
    • Note the IP address and port.
  • On the source machine, use a VNC or RDP client to connect to the target machine's display.

4. USB-C Display Input

  • This is not natively supported in GNOME or Linux. Most Linux distributions do not support using a USB-C port as an input for another computer's display. You would need a USB-C capture card (like an Elgato Cam Link or Magewell USB Capture) to make it work, but this is more typical for cameras or HDMI input, not for displaying another computer's screen.

5. Alternative: Use a USB-C Dock or Adapter

  • If you want to use the USB-C port as an output (not input), you can connect a monitor to the target machine and use the source machine to control it via network or remote desktop.

Summary Table

GNOME Remote Desktop
No
Yes
Works over network, not USB-C input
USB-C Display Input
Yes (capture card)
No
Not natively supported in Linux
USB-C Dock/Adapter
Yes (dock)
No
For output only, not input

In short:
You cannot directly use a USB-C cable to make one Debian GNOME system appear as a display to another Debian GNOME system. You need either:

  • A USB-C capture card (for input), or
  • GNOME Remote Desktop (for network-based remote display).

Would you like a step-by-step guide for setting up GNOME Remote Desktop, or are you specifically looking for a USB-C input solution?

Apr 6, 2:10pm

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