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I have a bluetooth dongle Cambridge Silicon Radio, Ltd Bluetooth Dongle (HCI mode). It starts successfully but don't get available devices to pair.

This is output of systemcctl status bluetooth.service:

● bluetooth.service - Bluetooth service
     Loaded: loaded (/lib/systemd/system/bluetooth.service; enabled; vendor preset: enabled)
     Active: active (running) since Sat 2021-06-19 03:33:03 +0430; 5min ago
       Docs: man:bluetoothd(8)
   Main PID: 30799 (bluetoothd)
     Status: "Running"
      Tasks: 1 (limit: 19005)
     Memory: 812.0K
     CGroup: /system.slice/bluetooth.service
             └─30799 /usr/lib/bluetooth/bluetoothd

ژوئن 19 03:33:03 heydar-ThinkStation-P300 systemd[1]: Starting Bluetooth service...
ژوئن 19 03:33:03 heydar-ThinkStation-P300 bluetoothd[30799]: Bluetooth daemon 5.53
ژوئن 19 03:33:03 heydar-ThinkStation-P300 systemd[1]: Started Bluetooth service.
ژوئن 19 03:33:03 heydar-ThinkStation-P300 bluetoothd[30799]: Starting SDP server
ژوئن 19 03:33:03 heydar-ThinkStation-P300 bluetoothd[30799]: Bluetooth management interface 1.17 initialized
ژوئن 19 03:33:03 heydar-ThinkStation-P300 bluetoothd[30799]: Endpoint registered: sender=:1.73 path=/MediaEndpoint/A2DPSink/sbc
ژوئن 19 03:33:03 heydar-ThinkStation-P300 bluetoothd[30799]: Endpoint registered: sender=:1.73 path=/MediaEndpoint/A2DPSource/sbc
ژوئن 19 03:33:05 heydar-ThinkStation-P300 bluetoothd[30799]: Loading LTKs timed out for hci0
ژوئن 19 03:33:13 heydar-ThinkStation-P300 bluetoothd[30799]: Failed to set mode: Failed (0x03)
ژوئن 19 03:33:24 heydar-ThinkStation-P300 bluetoothd[30799]: Failed to set mode: Failed (0x03)

hciconfig hci0:

hci0:   Type: Primary  Bus: USB
        BD Address: 00:1A:7D:DA:71:10  ACL MTU: 640:4  SCO MTU: 64:8
        UP RUNNING 
        RX bytes:1238 acl:0 sco:0 events:73 errors:0
        TX bytes:2771 acl:0 sco:0 commands:75 errors:0
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  • What do you see when you type hciconfig hci0 into the Terminal? Does the system complain "No such device"? – matigo Jun 21 at 8:14
  • added to question. – heydar dasoomi Jun 21 at 16:06

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