MIDI device connects over Bluetooth then disconnects

[Marcel Brouillet]

Hello,

I have recompiled Bluez from source following https://tttapa.github.io/Pages/Ubuntu/Software-Installation/BlueZ.html to enable MIDI support. I used the same version as the original Ubuntu Studio 20.04 pré-installed version : 5.64 (https://mirrors.edge.kernel.org/pub/linux/bluetooth/bluez-5.64.tar.gz).

I have a Korg nanoKONTROL Studio MIDI controller which connects either USB (works fine) or Bluetooth.

Before recompiling, bluetooth would connect the controller in a stable manner but no MIDI signal would be available, which is why I recompiled.

After recompiling with MIDI enabled, it connects and then disconnects after a few seconds. I must be a step further, but what's next ?

Below information as requested on https://discourse.ubuntu.com/t/bluez-report-a-bug/19994

>>>>>>>>>>>>>>>

marcel@ux582lr:~$ uname -a
Linux ux582lr 5.15.0-72-lowlatency #79-Ubuntu SMP PREEMPT Thu Apr 20 12:16:31 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux

marcel@ux582lr:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 22.04.2 LTS
Release: 22.04
Codename: jammy

marcel@ux582lr:~$ sudo hciconfig -a
hci0: Type: Primary Bus: USB
 BD Address: 64:BC:58:F6:52:15 ACL MTU: 1021:4 SCO MTU: 96:6
 UP RUNNING PSCAN
 RX bytes:734098 acl:139 sco:0 events:102905 errors:0
 TX bytes:62006976 acl:94081 sco:0 commands:8751 errors:0
 Features: 0xbf 0xfe 0x0f 0xfe 0xdb 0xff 0x7b 0x87
 Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3
 Link policy: RSWITCH SNIFF
 Link mode: PERIPHERAL ACCEPT
 Name: 'ux582lr'
 Class: 0x7c010c
 Service Classes: Rendering, Capturing, Object Transfer, Audio, Telephony
 Device Class: Computer, Laptop
 HCI Version: 5.2 (0xb) Revision: 0x237e
 LMP Version: 5.2 (0xb) Subversion: 0x237e
 Manufacturer: Intel Corp. (2)

marcel@ux582lr:~$ bluetoothctl
Agent registered
[JBL Xtreme camouflage]# show
Controller 64:BC:58:F6:52:15 (public)
 Name: ux582lr
 Alias: ux582lr
 Class: 0x007c010c
 Powered: yes
 Discoverable: no
 DiscoverableTimeout: 0x000000b4
 Pairable: yes
 UUID: Message Notification Se.. (00001133-0000-1000-8000-00805f9b34fb)
 UUID: A/V Remote Control (0000110e-0000-1000-8000-00805f9b34fb)
 UUID: OBEX Object Push (00001105-0000-1000-8000-00805f9b34fb)
 UUID: Message Access Server (00001132-0000-1000-8000-00805f9b34fb)
 UUID: PnP Information (00001200-0000-1000-8000-00805f9b34fb)
 UUID: IrMC Sync (00001104-0000-1000-8000-00805f9b34fb)
 UUID: Headset (00001108-0000-1000-8000-00805f9b34fb)
 UUID: A/V Remote Control Target (0000110c-0000-1000-8000-00805f9b34fb)
 UUID: Generic Attribute Profile (00001801-0000-1000-8000-00805f9b34fb)
 UUID: Phonebook Access Server (0000112f-0000-1000-8000-00805f9b34fb)
 UUID: Audio Sink (0000110b-0000-1000-8000-00805f9b34fb)
 UUID: Device Information (0000180a-0000-1000-8000-00805f9b34fb)
 UUID: Generic Access Profile (00001800-0000-1000-8000-00805f9b34fb)
 UUID: Handsfree Audio Gateway (0000111f-0000-1000-8000-00805f9b34fb)
 UUID: Audio Source (0000110a-0000-1000-8000-00805f9b34fb)
 UUID: OBEX File Transfer (00001106-0000-1000-8000-00805f9b34fb)
 Modalias: usb:v1D6Bp0246d0540
 Discovering: no
 Roles: central
 Roles: peripheral
Advertising Features:
 ActiveInstances: 0x00 (0)
 SupportedInstances: 0x08 (8)
 SupportedIncludes: tx-power
 SupportedIncludes: appearance
 SupportedIncludes: local-name
 SupportedSecondaryChannels: 1M
 SupportedSecondaryChannels: 2M
 SupportedSecondaryChannels: Coded

>>>> By default: >>>>
[JBL Xtreme camouflage]# devices
Device F8:DF:15:D2:19:B6 JBL Xtreme noire
Device FE:40:1F:32:02:0C M585/M590
Device 00:42:79:DA:F3:3D JBL Xtreme camouflage

>>>> When I hit Search in the Bluetooth GUI at T=0 >>>>
[CHG] Controller 64:BC:58:F6:52:15 Discovering: yes
[NEW] Device 00:9D:6B:7E:37:93 nanoKONTROL Studio

[JBL Xtreme camouflage]# devices
Device F8:DF:15:D2:19:B6 JBL Xtreme noire
Device FE:40:1F:32:02:0C M585/M590
Device 00:42:79:DA:F3:3D JBL Xtreme camouflage
Device 00:9D:6B:7E:37:93 nanoKONTROL Studio

[JBL Xtreme camouflage]# info 00:9D:6B:7E:37:93
Device 00:9D:6B:7E:37:93 (public)
 Name: nanoKONTROL Studio
 Alias: nanoKONTROL Studio
 Paired: no
 Trusted: no
 Blocked: no
 Connected: no
 LegacyPairing: no
 UUID: Vendor specific (03b80e5a-ede8-4b33-a751-6ce34ec4c700)
 RSSI: -65

>>>> 10 seconds after T >>>>
[CHG] Device 00:9D:6B:7E:37:93 RSSI is nil
[CHG] Controller 64:BC:58:F6:52:15 Discovering: no

>>>> 30 seconds after T >>>>
[DEL] Device 00:9D:6B:7E:37:93 nanoKONTROL Studio
[JBL Xtreme camouflage]#

marcel@ux582lr:~$ sudo apt install wireless-tools
wireless-tools is already the newest version (30~pre9-13.1ubuntu4).
wireless-tools set to manually installed.
0 upgraded, 0 newly installed, 0 to remove and 26 not upgraded.

>>>> ...yet... >>>>
marcel@ux582lr:~$ sudo wireless-tools.rfkill list
sudo: wireless-tools.rfkill: command not found

>>>> Attached : >>>>>
hcitrace.snoop as requested on https://discourse.ubuntu.com/t/bluez-report-a-bug/19994
system-log.bz2 could not be uploaded here, but is available 30 days under this link https://edagora.fromsmash.com/1.-iA2.a1y-ct

Thank you for any help.
Marcel.

[Marcel Brouillet (mbrouillet)]

marcel@ux582lr:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 22.04.2 LTS
Release: 22.04
Codename: jammy

[Marcel Brouillet (mbrouillet)]

Problem SOLVED by upgrading the equipment's firmware from version 1.4 to version 1.5.
Korq NanoKontrol Studio firmware here : https://www.korg.com/us/support/download/software/0/552/2978/.
Seems to work fine. I'll report further issues or bugs in a separate report, if any