蓝牙已打开，但无法找到或无法被任何其他设备找到。
的输出sudo service bluetooth status：
? bluetooth.service - Bluetooth service
Loaded: loaded (/lib/systemd/system/bluetooth.service; enabled; vendor preset: enabled)
Active: active (running) since ??? 2015-06-04 22:33:18 GET; 13min ago
Main PID: 26678 (bluetoothd)
CGroup: /system.slice/bluetooth.service
??26678 /usr/sbin/bluetoothd -n
??? 04 22:39:14 Rangoo bluetoothd[26678]: Endpoint registered: sender=:1.63 path=/MediaEndpoint/BlueZ4/HFPAG
??? 04 22:39:14 Rangoo bluetoothd[26678]: Endpoint registered: sender=:1.63 path=/MediaEndpoint/BlueZ4/HFPHS
??? 04 22:39:14 Rangoo bluetoothd[26678]: Endpoint registered: sender=:1.63 path=/MediaEndpoint/BlueZ4/A2DPSource
??? 04 22:39:14 Rangoo bluetoothd[26678]: Endpoint registered: sender=:1.63 path=/MediaEndpoint/BlueZ4/A2DPSink
??? 04 22:39:14 Rangoo bluetoothd[26678]: bluetoothd[26678]: …