steps to reproduce:

     1) Use GUI (settings/bluetooth) to connect BT dongle attached to PC

     2) Switch to multimedia.

     3) On PC side, use bluetoothctl

          - disconnect

                            [m3ulcb]# disconnect
                            Attempting to disconnect from 00:1A:7D:DA:71:0F
                            Successful disconnected
                            [CHG] Device 00:1A:7D:DA:71:0F Connected: no
                            [bluetooth]# 

          - connect <dev>

                             [bluetooth]# connect 00:1A:7D:DA:71:0F
                             Attempting to connect to 00:1A:7D:DA:71:0F
                             [CHG] Device 00:1A:7D:DA:71:0F Connected: yes
                             Connection successful
                             [CHG] Device 00:1A:7D:DA:71:0F ServicesResolved: yes
                             [m3ulcb]#