cannot connect to a bluetooth speaker

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Hi all

I've tried posting this message via the web interface yesterday, but I don't see it in the archives. So I'm sending it again by regular email.

I have two speakers:

$ hcitool scan
Scanning ...
	AC:89:95:DA:52:5E	Beoplay M5_27502524
	00:12:6F:3F:BD:D5	Mu-so Qb BT 7047

I can connect via bluetooth to both using my Android phone.
I can connect via bluetooth only to Mu-so using Fedora 27.

If I try the bluetooth connection using GNOME setting, I don't get much information. I just see that it tries the connection and after a while it fails.
On a terminal I get a timeout:

$ bt-device -c AC:89:95:DA:52:5E
Connecting to: AC:89:95:DA:52:5E
Error: Timeout was reached

Finally, journalctl seems to suggest that may be some kernel problem?!?

Mar 22 07:36:45 fedora kernel: Bluetooth: hci0: last event is not cmd complete (0x0f)

I found the same error message in this bug report, which is for Fedora 28 though:
https://bugzilla.redhat.com/show_bug.cgi?id=1514836#c15

Thanks in advance for any suggestion
Federico


PS The bluetooth service is running fine:

$ systemctl status bluetooth
* bluetooth.service - Bluetooth service
Loaded: loaded (/usr/lib/systemd/system/bluetooth.service; enabled; vendor preset: enabled)
  Active: active (running) since Thu 2018-03-22 07:25:05 CET; 26min ago
    Docs: man:bluetoothd(8)
Main PID: 759 (bluetoothd)
  Status: "Running"
   Tasks: 1 (limit: 4915)
  CGroup: /system.slice/bluetooth.service
          `-759 /usr/libexec/bluetooth/bluetoothd

Mar 22 07:25:05 fedora systemd[1]: Starting Bluetooth service...
Mar 22 07:25:05 fedora bluetoothd[759]: Bluetooth daemon 5.48
Mar 22 07:25:05 fedora bluetoothd[759]: Starting SDP server
Mar 22 07:25:05 fedora systemd[1]: Started Bluetooth service.
Mar 22 07:25:05 fedora bluetoothd[759]: Bluetooth management interface 1.14 initialized Mar 22 07:25:19 fedora bluetoothd[759]: Endpoint registered: sender=:1.69 path=/MediaEndpoint/A2DPSource Mar 22 07:25:19 fedora bluetoothd[759]: Endpoint registered: sender=:1.69 path=/MediaEndpoint/A2DPSink
Mar 22 07:42:45 fedora bluetoothd[759]: No cache for AC:89:95:DA:52:5E


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