过了一段时间，蓝牙在 ubuntu 16.04 上停止工作，而在 windows 上仍然可以正常工作。指示灯亮着，但当我进入蓝牙服务并启动设备搜索时，它只是继续搜索而没有找到任何东西。我尝试了网上找到的许多建议，但没有结果。
这些是一些调试输出：
sudo service bluetooth status
● bluetooth.service - Bluetooth service
Loaded: loaded (/lib/systemd/system/bluetooth.service; enabled; vendor preset: enabled)
Active: active (running) since mar 2018-02-27 00:09:03 CET; 10min ago
Docs: man:bluetoothd(8)
Main PID: 943 (bluetoothd)
Status: "Running"
CGroup: /system.slice/bluetooth.service
└─943 /usr/lib/bluetooth/bluetoothd
feb 27 00:09:03 marco-X550JF bluetoothd[943]: Not enough free handles to register service
feb 27 00:09:03 marco-X550JF bluetoothd[943]: Sap driver initialization failed.
feb 27 00:09:03 marco-X550JF bluetoothd[943]: sap-server: Operation not permitted (1)
feb 27 00:09:11 marco-X550JF bluetoothd[943]: Endpoint registered: sender=:1.36 path=/MediaEndpoint/A2DPSource
feb 27 00:09:11 marco-X550JF bluetoothd[943]: Endpoint registered: sender=:1.36 path=/MediaEndpoint/A2DPSink
feb 27 00:09:17 marco-X550JF bluetoothd[943]: Endpoint registered: sender=:1.69 path=/MediaEndpoint/A2DPSource
feb 27 00:09:17 marco-X550JF bluetoothd[943]: Endpoint registered: sender=:1.69 path=/MediaEndpoint/A2DPSink
feb 27 00:09:17 marco-X550JF bluetoothd[943]: RFCOMM server failed for Headset Voice gateway: rfcomm_bind: Address already in use (98)
feb 27 00:09:32 marco-X550JF bluetoothd[943]: Endpoint unregistered: sender=:1.36 path=/MediaEndpoint/A2DPSource
feb 27 00:09:32 marco-X550JF bluetoothd[943]: Endpoint unregistered: sender=:1.36 path=/MediaEndpoint/A2DPSink
和
dmesg | grep Blue
[ 1.485255] usb 3-5: Product: Bluetooth Radio
[ 20.381051] Bluetooth: Core ver 2.22
[ 20.381079] Bluetooth: HCI device and connection manager initialized
[ 20.381081] Bluetooth: HCI socket layer initialized
[ 20.381083] Bluetooth: L2CAP socket layer initialized
[ 20.381087] Bluetooth: SCO socket layer initialized
[ 20.390200] Bluetooth: hci0: rtl: examining hci_ver=06 hci_rev=000a lmp_ver=06 lmp_subver=8821
[ 20.390202] Bluetooth: hci0: rtl: loading rtl_bt/rtl8821a_config.bin
[ 20.525847] Bluetooth: hci0: rtl: loading rtl_bt/rtl8821a_fw.bin
[ 20.575191] Bluetooth: hci0: rom_version status=0 version=1
[ 20.575195] Bluetooth: cfg_sz 0, total size 17428
[ 24.759641] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 24.759642] Bluetooth: BNEP filters: protocol multicast
[ 24.759644] Bluetooth: BNEP socket layer initialized
[ 32.342069] Bluetooth: RFCOMM TTY layer initialized
[ 32.342073] Bluetooth: RFCOMM socket layer initialized
[ 32.342076] Bluetooth: RFCOMM ver 1.11
[ 34.368047] Bluetooth: hci0 command 0x0c24 tx timeout
[ 36.380036] Bluetooth: hci0 command 0x0c52 tx timeout
rfkill 列表：
0: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
1: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
有什么想法吗？谢谢