Updated: 2018-12-31 21:37:51 CST +08

Bluetooth Not Working on Ubuntu

Problem

Turn Bluetooth on by Indicator Applet, but there are no adapters showing on Bluetooth Adapters, and no device showing on Bluetooth Manager.

Problem Identification

  • Check bluetooth process, OK.

    $ systemctl status bluetooth
● bluetooth.service - Bluetooth service
Loaded: loaded (/lib/systemd/system/bluetooth.service; enabled; vendor preset: enabled)
Active: active (running) since Sun 2018-12-30 01:33:45 CST; 1 day 17h ago
    Docs: man:bluetoothd(8)
Main PID: 16797 (bluetoothd)
Status: "Running"
    Tasks: 1 (limit: 4915)
CGroup: /system.slice/bluetooth.service
        └─16797 /usr/lib/bluetooth/bluetoothd

  • Check bluetooth devices by hciconfig, no device found.

    $ hciconfig -a
hci0:   Type: Primary  Bus: USB
    BD Address: 00:00:00:00:00:00  ACL MTU: 0:0  SCO MTU: 0:0
    DOWN
    RX bytes:0 acl:0 sco:0 events:0 errors:0
    TX bytes:0 acl:0 sco:0 commands:0 errors:0
    Features: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
    Packet type: DM1 DH1 HV1
    Link policy:
    Link mode: SLAVE ACCEPT

  • Check bluetooth control interface, no default controller available.

    $ bluetoothctl
Agent registered
[bluetooth]# scan on
No default controller available

Solution

  • Hot remove and reload the kernel module

    $ sudo rmmod btusb
$ sudo modprobe btusb

  • Check bluetooth devices by hciconfig again.

    $ hciconfig -a
hci0:   Type: Primary  Bus: USB
    BD Address: 58:00:E3:C5:C1:E8  ACL MTU: 1024:8  SCO MTU: 50:8
    UP RUNNING
    RX bytes:759 acl:0 sco:0 events:58 errors:0
    TX bytes:4853 acl:0 sco:0 commands:58 errors:0
    Features: 0xff 0xfe 0x8f 0xfe 0xd8 0x3f 0x5b 0x87
    Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3
    Link policy: RSWITCH HOLD SNIFF
    Link mode: SLAVE ACCEPT
    Name: 'ideapad-510S'
    Class: 0x1c010c
    Service Classes: Rendering, Capturing, Object Transfer
    Device Class: Computer, Laptop
    HCI Version: 4.1 (0x7)  Revision: 0x0
    LMP Version: 4.1 (0x7)  Subversion: 0x25a
    Manufacturer: Qualcomm (29)

  • Use bluetoothctl to manipulate bluetooth.

    $ bluetoothctl
[NEW] Controller 58:00:E3:C5:C1:E8 ideapad-510S [default]
[NEW] Device 00:11:67:55:66:AA Soundbody
Agent registered
[bluetooth]# list
Controller 58:00:E3:C5:C1:E8 ideapad-510S [default]
[bluetooth]# devices
Device 00:11:67:55:66:AA Soundbody

Reference