Hi ! I'm struggling to connect Bluetooth mouse via USB BT 4 dongle (some unknown brand from China bought in domestic store). Everything works on Windows, so its seems to be a software issue on Leap 15.2. For whatever reason system can't init device: Can't init device hci0: Invalid argument (22) I can buy another Bluetooth dongle but I'm not sure problem will be solved because it could be again same chipset (Cambridge Silicon Radio). All possible output below. Thanks in advance. # ----------------------------------------- # uname -r 5.3.18-lp152.87-default # ----------------------------------------- # sudo systemctl status bluetooth.service ● bluetooth.service - Bluetooth service Loaded: loaded (/usr/lib/systemd/system/bluetooth.service; enabled; vendor preset: disabled) Active: active (running) since Thu 2021-09-02 19:04:19 EEST; 28min ago Docs: man:bluetoothd(8) Main PID: 2978 (bluetoothd) Status: "Running" Tasks: 1 CGroup: /system.slice/bluetooth.service └─2978 /usr/lib/bluetooth/bluetoothd Sep 02 19:04:19 linux-ijnq systemd[1]: Starting Bluetooth service... Sep 02 19:04:19 linux-ijnq bluetoothd[2978]: Bluetooth daemon 5.48 Sep 02 19:04:19 linux-ijnq systemd[1]: Started Bluetooth service. Sep 02 19:04:19 linux-ijnq bluetoothd[2978]: Starting SDP server Sep 02 19:04:19 linux-ijnq bluetoothd[2978]: Bluetooth management interface 1.14 initialized # ----------------------------------------- # groups andrei andrei : users dialout lp # ----------------------------------------- # rfkill ID TYPE DEVICE SOFT HARD 0 bluetooth hci0 unblocked unblocked # ----------------------------------------- # hciconfig hci0 up Can't init device hci0: Invalid argument (22) # ----------------------------------------- # hciconfig iscan hci0: Type: Primary Bus: USB BD Address: 00:1A:7D:DA:71:13 ACL MTU: 679:8 SCO MTU: 48:16 DOWN RX bytes:1765 acl:0 sco:0 events:55 errors:0 TX bytes:170 acl:0 sco:0 commands:55 errors:0 # ----------------------------------------- # lsusb | grep -i blue Bus 001 Device 003: ID 0a12:0001 Cambridge Silicon Radio, Ltd Bluetooth Dongle (HCI mode) # ----------------------------------------- # sudo dmesg | egrep -i 'blue|firm' [ 0.194364] Spectre V2 : Enabling Restricted Speculation for firmware calls [ 4.221648] Bluetooth: Core ver 2.22 [ 4.221666] Bluetooth: HCI device and connection manager initialized [ 4.221672] Bluetooth: HCI socket layer initialized [ 4.221674] Bluetooth: L2CAP socket layer initialized [ 4.221677] Bluetooth: SCO socket layer initialized [ 4.985394] Bluetooth: BNEP (Ethernet Emulation) ver 1.3 [ 4.985395] Bluetooth: BNEP filters: protocol multicast [ 4.985398] Bluetooth: BNEP socket layer initialized