DeepSeek: Bluetooth on NixOS using LXQt desktop

I am running LXQt under NixOS and having problems getting Bluetooth to work. My computer is a old ThinkPad T61. The configuration.nix file currently uses pipewire instead of PulseAudio. Suggestions?

DeepSeek Response:

Getting Bluetooth to work on an older ThinkPad T61 running LXQt under NixOS with PipeWire instead of PulseAudio can be a bit tricky, but it’s definitely possible. Here’s a step-by-step guide to help you troubleshoot and configure Bluetooth properly:

1. Ensure Bluetooth Hardware is Recognized

First, verify that your Bluetooth hardware is detected by the system. Run the following command:

lsusb

Look for a Bluetooth adapter in the output. If it’s not listed, your hardware might not be supported or could be disabled in the BIOS.

2. Enable Bluetooth Services in `configuration.nix`

Ensure that the necessary Bluetooth services are enabled in your configuration.nix file. Add or update the following lines:

{
  hardware.bluetooth.enable = true; # Enable Bluetooth support
  services.blueman.enable = true;  # Optional: Blueman GUI for managing Bluetooth
  services.pipewire = {
    enable = true;
    alsa.enable = true;
    pulse.enable = true; # Enable PipeWire PulseAudio compatibility layer
  };
}

After making changes, rebuild your system:

sudo nixos-rebuild switch

3. Install Bluetooth Tools

Ensure you have the necessary Bluetooth utilities installed. Add the following to your environment.systemPackages in configuration.nix:

{
  environment.systemPackages = with pkgs; [
    bluez          # Bluetooth protocol stack
    bluez-tools    # Additional Bluetooth tools
    blueman        # Optional: GUI for managing Bluetooth
  ];
}

Rebuild your system again.

4. Start and Enable Bluetooth Service

Ensure the Bluetooth service is running:

sudo systemctl enable bluetooth.service
sudo systemctl start bluetooth.service

Check the status of the service:

sudo systemctl status bluetooth.service

If the service fails to start, check the logs for errors:

journalctl -u bluetooth.service

5. Configure PipeWire for Bluetooth Audio

PipeWire should handle Bluetooth audio out of the box, but ensure the following:

The pipewire-pulse service is running:

  systemctl --user status pipewire-pulse.service

If not, start it:

  systemctl --user start pipewire-pulse.service

6. Pair and Connect Devices

Use bluetoothctl or Blueman to pair and connect your Bluetooth devices.

Using `bluetoothctl`:

Open a terminal and run:

   bluetoothctl

Turn on Bluetooth:

   power on

Enable agent:

   agent on

Scan for devices:

   scan on

Pair and connect to your device:

   pair <DEVICE_MAC>
   trust <DEVICE_MAC>
   connect <DEVICE_MAC>

Using Blueman:

Launch Blueman from your LXQt menu and follow the GUI to pair and connect your device.

7. Troubleshooting

No Sound Through Bluetooth: Ensure the correct audio profile is selected. Use pavucontrol (PulseAudio Volume Control) to check and switch the profile to A2DP for high-quality audio or HSP/HFP for headset functionality.
Bluetooth Device Not Found: Ensure your Bluetooth adapter is not blocked. Run:

  rfkill list

If it’s blocked, unblock it:

  rfkill unblock bluetooth

Permissions Issues: Ensure your user is in the lp group (required for Bluetooth):

  sudo usermod -aG lp $USER

8. Additional Resources

NixOS Wiki: Bluetooth
PipeWire Documentation: PipeWire