Arch Linux

Seooo

Member

Registered: 2020-04-01

Posts: 9

Bluetooth module not loaded at startup

Hi,
I have followed the Arch wiki to setup the Bluetooth but I have problem in loading btusb. I have installed bluez bluez-utils, loaded btusb and then start/enable the Bluetooth service. Now the problem is that each time I reboot my machine, the module btusb is not loaded anymore thus the Bluetooth does not work.

If I search for the btusb module I cannot find it in the list of loaded modules

$ lsmod | grep btusb
$ systemctl status bluetooth
○ bluetooth.service - Bluetooth service
     Loaded: loaded (/usr/lib/systemd/system/bluetooth.service; enabled; vendor preset: disabled)
     Active: inactive (dead)
       Docs: man:bluetoothd(8)

The service starts only if I load the module manually each time

$ modprobe btusb
$ systemctl enable bluetooth
$ systemctl start bluetooth

$ sudo systemctl status bluetooth
● bluetooth.service - Bluetooth service
     Loaded: loaded (/usr/lib/systemd/system/bluetooth.service; enabled; vendor preset: disabled)
     Active: active (running) since Wed 2021-06-23 14:48:19 CEST; 3s ago
       Docs: man:bluetoothd(8)
   Main PID: 1693 (bluetoothd)
     Status: "Running"
      Tasks: 1 (limit: 38222)
     Memory: 1.8M
        CPU: 20ms
     CGroup: /system.slice/bluetooth.service
             └─1693 /usr/lib/bluetooth/bluetoothd

Jun 23 14:48:19 MATTE-WORK systemd[1]: Starting Bluetooth service...
Jun 23 14:48:19 MATTE-WORK bluetoothd[1693]: Bluetooth daemon 5.59
Jun 23 14:48:19 MATTE-WORK systemd[1]: Started Bluetooth service.
Jun 23 14:48:19 MATTE-WORK bluetoothd[1693]: Starting SDP server
Jun 23 14:48:19 MATTE-WORK bluetoothd[1693]: Bluetooth management interface 1.19 initialized

I really cannot understand why the module is not loaded automatically at startup. Can you help me?

V1del

Forum Moderator

Registered: 2012-10-16

Posts: 21,627

Re: Bluetooth module not loaded at startup

It should be autoloaded for supported HW. Do you use some power manager like laptop-mode-tools or TLP that might blacklist/try to handle the module itself based on configuration? Which HW does it ultimately bind to, what's your output of

lsusb #needs usbutils
lsusb -t

Seooo

Member

Registered: 2020-04-01

Posts: 9

Re: Bluetooth module not loaded at startup

It should be autoloaded for supported HW. Do you use some power manager like laptop-mode-tools or TLP that might blacklist/try to handle the module itself based on configuration? Which HW does it ultimately bind to, what's your output of

lsusb #needs usbutils
lsusb -t

I do not use any of these tools. I want to add that this problem arises after I reinstalled bluez and bluez-utils (for other reasons). Before re-installation everything works and the module was loaded automatically for my HW.

$ lsusb
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 005: ID 06cb:00d4 Synaptics, Inc. 
Bus 001 Device 004: ID 04f2:b67e Chicony Electronics Co., Ltd TOSHIBA Web Camera - HD
Bus 001 Device 003: ID 046d:c328 Logitech, Inc. Corded Keyboard K280e
Bus 001 Device 002: ID 145f:0263 Trust Trust Wireless Mouse
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

$ lsusb -t
/:  Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 10000M
/:  Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 480M
/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/6p, 10000M
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/12p, 480M
    |__ Port 1: Dev 2, If 0, Class=Human Interface Device, Driver=usbhid, 12M
    |__ Port 3: Dev 3, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M
    |__ Port 3: Dev 3, If 1, Class=Human Interface Device, Driver=usbhid, 1.5M
    |__ Port 7: Dev 4, If 0, Class=Video, Driver=uvcvideo, 480M
    |__ Port 7: Dev 4, If 1, Class=Video, Driver=uvcvideo, 480M
    |__ Port 7: Dev 4, If 2, Class=Video, Driver=uvcvideo, 480M
    |__ Port 7: Dev 4, If 3, Class=Video, Driver=uvcvideo, 480M
    |__ Port 8: Dev 5, If 0, Class=Vendor Specific Class, Driver=, 12M

Seooo

Member

Registered: 2020-04-01

Posts: 9

Re: Bluetooth module not loaded at startup

Problem solved. The issue is related to the version 5.59-2 of bluez. To solve you need to remove the cache and downgrade bluez <= 5.58

$ sudo rm -rf /var/lib/bluetooth
$ downgrade bluez

Downgrading also bluez-utils is not needed. After having downgraded bluez you have to start/enable the bluetooth service. The kernel module btusb should be loaded automatically.

related discussion: https://github.com/bluez/bluez/issues/157

Thank you for the support.