I just bought a new mouse, a Logitech MX Anywhere 2 because on my Laptop I need to dual-boot between Arch and Windows and this mouse supports up to three profiles/devices. The MX Anywhere 2 mouse is a bluetooth 4 LE device, the Laptop a Dell E7440 (00:19.0 Ethernet controller: Intel Corporation Ethernet Connection I218-LM (rev 04)) Running Windows there is no problem at all. Running Arch (KDE5) the mouse shows as "Type unknown" but "Paired" but the mouse does not work at all. Version information: bluez-5.39-1 Investigating the things on the console I get the following: # hciconfig hci0 hci0: Type: BR/EDR Bus: USB BD Address: 0C:8B:FD:EA:A7:67 ACL MTU: 1021:5 SCO MTU: 96:5 UP RUNNING PSCAN ISCAN RX bytes:1580 acl:0 sco:0 events:189 errors:0 TX bytes:29212 acl:0 sco:0 commands:184 errors:0 # bluetoothctl [NEW] Controller 0C:8B:FD:EA:A7:67 E7440 [default] [bluetooth]# power on Changing power on succeeded [bluetooth]# scan on Discovery started [CHG] Controller 0C:8B:FD:EA:A7:67 Discovering: yes [NEW] Device C0:D3:2A:76:D3:A1 MX Anywhere 2 [bluetooth]# pair C0:D3:2A:76:D3:A1 Attempting to pair with C0:D3:2A:76:D3:A1 Failed to pair: org.bluez.Error.AuthenticationRejected [bluetooth]# trust C0:D3:2A:76:D3:A1 [CHG] Device C0:D3:2A:76:D3:A1 Trusted: yes Changing C0:D3:2A:76:D3:A1 trust succeeded [bluetooth]# pair C0:D3:2A:76:D3:A1 Attempting to pair with C0:D3:2A:76:D3:A1 Failed to pair: org.bluez.Error.AuthenticationRejected [bluetooth]# connect C0:D3:2A:76:D3:A1 Attempting to connect to C0:D3:2A:76:D3:A1 Failed to connect: org.bluez.Error.Failed The kernel shows up this message Apr 21 12:03:40 E7440 kernel: Bluetooth: HCI request failed to create LE connection: status 0x0c The hcidump is here: HCI sniffer - Bluetooth packet analyzer ver 5.39 device: hci0 snap_len: 1500 filter: 0xffffffffffffffff ^[[A^[[A^[[A< HCI Command: LE Add Device To White List (0x08|0x0011) plen 7 > HCI Event: Command Complete (0x0e) plen 4 LE Add Device To White List (0x08|0x0011) ncmd 1 status 0x00 < HCI Command: LE Set Scan Parameters (0x08|0x000b) plen 7 type 0x00 (passive) interval 60.000ms window 30.000ms own address: 0x00 (Public) policy: white list only > HCI Event: Command Complete (0x0e) plen 4 LE Set Scan Parameters (0x08|0x000b) ncmd 1 status 0x00 < HCI Command: LE Set Scan Enable (0x08|0x000c) plen 2 value 0x01 (scanning enabled) filter duplicates 0x01 (enabled) > HCI Event: Command Complete (0x0e) plen 4 LE Set Scan Enable (0x08|0x000c) ncmd 2 status 0x00 > HCI Event: LE Meta Event (0x3e) plen 38 LE Advertising Report ADV_IND - Connectable undirected advertising (0) bdaddr C0:D3:2A:76:D3:A1 (Random) Flags: 0x05 Unknown type 0x19 with 2 bytes data Complete service classes: 0x1812 Complete local name: 'MX Anywhere 2' RSSI: -43 < HCI Command: LE Set Scan Enable (0x08|0x000c) plen 2 value 0x00 (scanning disabled) filter duplicates 0x00 (disabled) > HCI Event: Command Complete (0x0e) plen 4 LE Set Scan Enable (0x08|0x000c) ncmd 2 status 0x00 < HCI Command: LE Create Connection (0x08|0x000d) plen 25 bdaddr C0:D3:2A:76:D3:A1 type 1 interval 96 window 96 initiator_filter 0 own_bdaddr_type 0 min_interval 40 max_interval 56 latency 0 supervision_to 42 min_ce 0 max_ce 0 > HCI Event: Command Status (0x0f) plen 4 LE Create Connection (0x08|0x000d) status 0x00 ncmd 2 > HCI Event: LE Meta Event (0x3e) plen 19 LE Connection Complete status 0x00 handle 3585, role master bdaddr C0:D3:2A:76:D3:A1 (Random) < HCI Command: LE Read Remote Used Features (0x08|0x0016) plen 2 > HCI Event: Command Status (0x0f) plen 4 LE Read Remote Used Features (0x08|0x0016) status 0x00 ncmd 1 > HCI Event: LE Meta Event (0x3e) plen 12 LE Read Remote Used Features Complete status 0x00 handle 3585 Features: 0x01 0x00 0x00 0x00 0x00 0x00 0x00 0x00 < ACL data: handle 3585 flags 0x00 dlen 7 ATT: MTU req (0x02) client rx mtu 517 > HCI Event: Number of Completed Packets (0x13) plen 5 handle 3585 packets 1 > ACL data: handle 3585 flags 0x02 dlen 7 ATT: MTU resp (0x03) server rx mtu 23 < ACL data: handle 3585 flags 0x00 dlen 11 ATT: Read By Group req (0x10) start 0x0001, end 0xffff type-uuid 0x2800 > HCI Event: Number of Completed Packets (0x13) plen 5 handle 3585 packets 1 > ACL data: handle 3585 flags 0x02 dlen 24 ATT: Read By Group resp (0x11) attr handle 0x0001, end group handle 0x0007 value 0x00 0x18 attr handle 0x0008, end group handle 0x000b value 0x01 0x18 attr handle 0x000c, end group handle 0x001a value 0x0a 0x18 < ACL data: handle 3585 flags 0x00 dlen 11 ATT: Read By Group req (0x10) start 0x001b, end 0xffff type-uuid 0x2800 > HCI Event: Number of Completed Packets (0x13) plen 5 handle 3585 packets 1 > ACL data: handle 3585 flags 0x02 dlen 18 ATT: Read By Group resp (0x11) attr handle 0x001b, end group handle 0x001e value 0x0f 0x18 attr handle 0x001f, end group handle 0x003e value 0x12 0x18 < ACL data: handle 3585 flags 0x00 dlen 11 ATT: Read By Group req (0x10) start 0x003f, end 0xffff type-uuid 0x2800 > HCI Event: Number of Completed Packets (0x13) plen 5 handle 3585 packets 1 > ACL data: handle 3585 flags 0x02 dlen 26 ATT: Read By Group resp (0x11) attr handle 0x003f, end group handle 0xffff value 0x6d 0x04 0x00 0x20 0x1f 0x01 0x00 0x80 0x00 0x10 0x00 0x00 0x00 0x00 0x01 0x00 < ACL data: handle 3585 flags 0x00 dlen 9 ATT: Write req (0x12) handle 0x000b value 0x02 0x00 > HCI Event: Number of Completed Packets (0x13) plen 5 handle 3585 packets 1 > ACL data: handle 3585 flags 0x02 dlen 5 ATT: Write resp (0x13) < ACL data: handle 3585 flags 0x00 dlen 7 ATT: Read req (0x0a) handle 0x0003 > HCI Event: Number of Completed Packets (0x13) plen 5 handle 3585 packets 1 > ACL data: handle 3585 flags 0x02 dlen 18 ATT: Read resp (0x0b) < ACL data: handle 3585 flags 0x00 dlen 7 ATT: Read req (0x0a) handle 0x0005 > HCI Event: Number of Completed Packets (0x13) plen 5 handle 3585 packets 1 > ACL data: handle 3585 flags 0x02 dlen 7 ATT: Read resp (0x0b) < ACL data: handle 3585 flags 0x00 dlen 7 ATT: Read req (0x0a) handle 0x001a > HCI Event: Number of Completed Packets (0x13) plen 5 handle 3585 packets 1 > ACL data: handle 3585 flags 0x02 dlen 12 ATT: Read resp (0x0b) < ACL data: handle 3585 flags 0x00 dlen 11 ATT: Read By Type req (0x08) start 0x001f, end 0x003e type-uuid 0x2803 > HCI Event: Number of Completed Packets (0x13) plen 5 handle 3585 packets 1 > ACL data: handle 3585 flags 0x02 dlen 27 ATT: Read By Type resp (0x09) length: 7 handle 0x0020, value 0x02 0x21 0x00 0x4a 0x2a handle 0x0022, value 0x12 0x23 0x00 0x22 0x2a handle 0x0025, value 0x0e 0x26 0x00 0x32 0x2a < ACL data: handle 3585 flags 0x00 dlen 11 ATT: Read By Type req (0x08) start 0x0026, end 0x003e type-uuid 0x2803 > HCI Event: Number of Completed Packets (0x13) plen 5 handle 3585 packets 1 > ACL data: handle 3585 flags 0x02 dlen 27 ATT: Read By Type resp (0x09) length: 7 handle 0x0027, value 0x12 0x28 0x00 0x33 0x2a handle 0x002a, value 0x02 0x2b 0x00 0x4b 0x2a handle 0x002c, value 0x12 0x2d 0x00 0x4d 0x2a < ACL data: handle 3585 flags 0x00 dlen 11 ATT: Read By Type req (0x08) start 0x002d, end 0x003e type-uuid 0x2803 > HCI Event: Number of Completed Packets (0x13) plen 5 handle 3585 packets 1 > ACL data: handle 3585 flags 0x02 dlen 27 ATT: Read By Type resp (0x09) length: 7 handle 0x0030, value 0x12 0x31 0x00 0x4d 0x2a handle 0x0034, value 0x12 0x35 0x00 0x4d 0x2a handle 0x0038, value 0x0e 0x39 0x00 0x4d 0x2a < ACL data: handle 3585 flags 0x00 dlen 11 ATT: Read By Type req (0x08) start 0x0039, end 0x003e type-uuid 0x2803 > HCI Event: Number of Completed Packets (0x13) plen 5 handle 3585 packets 1 > ACL data: handle 3585 flags 0x02 dlen 20 ATT: Read By Type resp (0x09) length: 7 handle 0x003b, value 0x04 0x3c 0x00 0x4c 0x2a handle 0x003d, value 0x06 0x3e 0x00 0x4e 0x2a < ACL data: handle 3585 flags 0x00 dlen 7 ATT: Read req (0x0a) handle 0x002b > HCI Event: Number of Completed Packets (0x13) plen 5 handle 3585 packets 1 > ACL data: handle 3585 flags 0x02 dlen 9 ATT: Error (0x01) Error: Insufficient authentication (5) Read req (0x0a) on handle 0x002b < ACL data: handle 3585 flags 0x00 dlen 7 ATT: Read req (0x0a) handle 0x002b > ACL data: handle 3585 flags 0x02 dlen 9 ATT: Error (0x01) Error: Insufficient authentication (5) Read req (0x0a) on handle 0x002b < ACL data: handle 3585 flags 0x00 dlen 7 ATT: Read req (0x0a) handle 0x002b > HCI Event: Number of Completed Packets (0x13) plen 5 handle 3585 packets 1 > HCI Event: Number of Completed Packets (0x13) plen 5 handle 3585 packets 1 > ACL data: handle 3585 flags 0x02 dlen 9 ATT: Error (0x01) Error: Insufficient authentication (5) Read req (0x0a) on handle 0x002b < ACL data: handle 3585 flags 0x00 dlen 7 ATT: Read req (0x0a) handle 0x002b > HCI Event: Number of Completed Packets (0x13) plen 5 handle 3585 packets 1 > ACL data: handle 3585 flags 0x02 dlen 9 ATT: Error (0x01) Error: Insufficient authentication (5) Read req (0x0a) on handle 0x002b < ACL data: handle 3585 flags 0x00 dlen 7 ATT: Read req (0x0a) handle 0x002b > HCI Event: Number of Completed Packets (0x13) plen 5 handle 3585 packets 1 ... and so on until it timeouts. 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