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<header>Updated: 2018-12-31 21:37:51 CST +08</header>
<main>
<h1 id="bluetooth-not-working-on-ubuntu">Bluetooth Not Working on Ubuntu</h1>
<h2 id="problem">Problem</h2>
<p>Turn Bluetooth on by Indicator Applet, but there are no adapters showing on Bluetooth Adapters, and no device showing on Bluetooth Manager.</p>
<h2 id="problem-identification">Problem Identification</h2>
<ul>
<li><p>Check bluetooth process, <em>OK</em>.</p>
<pre><code class="language-shell">$ 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
</code></pre></li>
<li><p>Check bluetooth devices by <code>hciconfig</code>, <strong>no device found</strong>.</p>
<pre><code class="language-shell">$ 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
</code></pre></li>
<li><p>Check bluetooth control interface, <strong>no default controller available</strong>.</p>
<pre><code class="language-shell">$ bluetoothctl
Agent registered
[bluetooth]# scan on
No default controller available
</code></pre></li>
</ul>
<h2 id="solution">Solution</h2>
<ul>
<li><p>Hot remove and reload the kernel module</p>
<pre><code class="language-console">$ sudo rmmod btusb
$ sudo modprobe btusb
</code></pre></li>
<li><p>Check bluetooth devices by <code>hciconfig</code> again.</p>
<pre><code class="language-shell">$ 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)
</code></pre></li>
<li><p>Use <code>bluetoothctl</code> to manipulate bluetooth.</p>
<pre><code class="language-shell">$ 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
</code></pre></li>
</ul>
<h2 id="reference">Reference</h2>
<ul>
<li><a href="https://bbs.archlinux.org/viewtopic.php?pid=1731068#p1731068">Bluetooth Issue: “No default controller available”@archlinux.org</a></li>
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