Skip to main content

Ubuntu 20.04 - Caveats for Tachyon

This page documents the known issues and limitations of the current version of the Tachyon board.

Known Issues​

1/ Tachyon does not boot from USB power alone​

  • Issue: The board requires a battery to be always connected or powered via the 5V header. USB power alone is not sufficient.
  • Background: The software does not currently support utilizing the USB PD power supply only. We are working on a patch to resolve this.
  • Fix Status: No hardware fix is known at the moment.

2/ Wi-Fi and WPA3.​

  • Issue: WPA3 doesn't work
  • Fix Status: For now, select WPA2 and it supports WPA2/WPA3. Fix is coming!

3/ Audio in Desktop.​

  • Issue: No audio output in Desktop mode
  • Fix Status: Currently, this is not supported by QCOM. A fix is due late May 2025

4/ Bluetooth in the Desktop build.​

  • Issue: GNOME Bluetooth manager somehow can't control bluez. Use blueman to control bluetooth in the meantime.
  • Fix Status: Investigating! Likely related to Dbus issues

Additional Notes​

USB connections for desktop mode​

Before powering on Tachyon in desktop mode, ensure the USB-C hub and HDMI display are connected. Otherwise, the device will remain in headless mode. We’re working on hotplug support.

First login delay​

The desktop may appear black for up to 5 seconds as it adjusts the display resolution. The system forces 1080p by default for compatibility. You can enable 4K manually.

Wi-Fi setup​

If Wi-Fi credentials are missing, use the menu to add them. For WPA3 networks, downgrade to WPA2 via the cog/settings icon until a future update enables full support.

Desktop rendering performance​

Ubuntu 20.04 uses software rendering for some UI elements. This can feel sluggish under load. We plan to improve this with 22.04, but it cannot be backported.

⚠️ Note: Although Tachyon can operate at desktop speeds, upgrading to 22.04 now would result in loss of key features and stability.