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20 April 2021

How to use bluetooth?

In a terminal, type bluetoothctl then power on. Do you get a message like "no default controller available" ?

  • If no, the way to use the bluetooth is:
  • - execute bluetoothctl

    - then type power on

    - scan on

    - pair MAC_OF_DEVICE

    - if using a device without a PIN, one may need to manually trust the device before it can reconnect successfully. To do so, type trust MAC_OF_DEVICE

    - connect MAC_OF_DEVICE

  • If yes, here are some things you can try:
  • - make sure your system and all packages are up to date

    - make sure your bluetooth firmware is installed

    - make sure the bluetooth module is loaded (run rmmod btusb then modprobe btusb)

    - check that there is no options preventing your bluetooth to be activated in your Bios

    - check that your bluetooth is not blocked by rfkill

    - in Archlinux, using the deprecated bluez-utils-compat in lieu of bluez-utils can help in some situations

    - try adding the kernel parameter btusb.enable_autosuspend=n

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