I can also reproduce this bug.
Notebook: Dell XPS 13 (9370) Wi-Fi/BT module: not sure... bluez: 5.50 BT mouse: logitech M336 (M337)
Log: [bluetooth]# paired-devices Device 34:88:5D:92:FC:0C Bluetooth Mouse M336/M337/M535 // try to connect the mouse [bluetooth]# connect 34:88:5D:92:FC:0C Attempting to connect to 34:88:5D:92:FC:0C Failed to connect: org.bluez.Error.Failed // try to connect in discovery mode [bluetooth]# connect 34:88:5D:92:FC:0C Attempting to connect to 34:88:5D:92:FC:0C [CHG] Device 34:88:5D:92:FC:0C Connected: yes [CHG] Device 34:88:5D:92:FC:0C ServicesResolved: yes Failed to connect: org.bluez.Error.NotAvailable [CHG] Device 34:88:5D:92:FC:0C ServicesResolved: no [CHG] Device 34:88:5D:92:FC:0C Connected: no // moving around the mouse [CHG] Device 34:88:5D:92:FC:0C Connected: yes [CHG] Device 34:88:5D:92:FC:0C Connected: no [CHG] Device 34:88:5D:92:FC:0C Connected: yes [CHG] Device 34:88:5D:92:FC:0C Connected: no [CHG] Device 34:88:5D:92:FC:0C Connected: yes [CHG] Device 34:88:5D:92:FC:0C Connected: no
I can also reproduce this bug.
Notebook: Dell XPS 13 (9370)
Wi-Fi/BT module: not sure...
bluez: 5.50
BT mouse: logitech M336 (M337)
Log: Error.Failed Error.NotAvaila ble
[bluetooth]# paired-devices
Device 34:88:5D:92:FC:0C Bluetooth Mouse M336/M337/M535
// try to connect the mouse
[bluetooth]# connect 34:88:5D:92:FC:0C
Attempting to connect to 34:88:5D:92:FC:0C
Failed to connect: org.bluez.
// try to connect in discovery mode
[bluetooth]# connect 34:88:5D:92:FC:0C
Attempting to connect to 34:88:5D:92:FC:0C
[CHG] Device 34:88:5D:92:FC:0C Connected: yes
[CHG] Device 34:88:5D:92:FC:0C ServicesResolved: yes
Failed to connect: org.bluez.
[CHG] Device 34:88:5D:92:FC:0C ServicesResolved: no
[CHG] Device 34:88:5D:92:FC:0C Connected: no
// moving around the mouse
[CHG] Device 34:88:5D:92:FC:0C Connected: yes
[CHG] Device 34:88:5D:92:FC:0C Connected: no
[CHG] Device 34:88:5D:92:FC:0C Connected: yes
[CHG] Device 34:88:5D:92:FC:0C Connected: no
[CHG] Device 34:88:5D:92:FC:0C Connected: yes
[CHG] Device 34:88:5D:92:FC:0C Connected: no