I can't connect my AKG Y50BT bluetooth headphones.
They appear in GNOME's bluetooth settings and sometimes they even seem to be connected, but then after a short period of time, they get disconnected again.
If I try to connect them manually using bluetoothctl, it looks as follows:
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$ sudo bluetoothctl
[bluetooth]# power on
Changing power on succeeded
[bluetooth]# agent on
Agent registered
[bluetooth]# scan on
Discovery started
[NEW] Device 34:DF:2A:28:C2:7F AKG Y50BT
[bluetooth]# scan off
Discovery stopped
[bluetooth]# trust 34:DF:2A:28:C2:7F
[CHG] Device 34:DF:2A:28:C2:7F Trusted: yes
Changing 34:DF:2A:28:C2:7F trust succeeded
[bluetooth]# pair 34:DF:2A:28:C2:7F
Attempting to pair with 34:DF:2A:28:C2:7F
[CHG] Device 34:DF:2A:28:C2:7F Connected: yes
[CHG] Device 34:DF:2A:28:C2:7F ServicesResolved: yes
[CHG] Device 34:DF:2A:28:C2:7F Paired: yes
Pairing successful
[CHG] Device 34:DF:2A:28:C2:7F ServicesResolved: no
[CHG] Device 34:DF:2A:28:C2:7F Connected: no
[bluetooth]# connect 34:DF:2A:28:C2:7F
Attempting to connect to 34:DF:2A:28:C2:7F
[CHG] Device 34:DF:2A:28:C2:7F Connected: yes
[CHG] Device 34:DF:2A:28:C2:7F UUIDs: 00001108-0000-1000-8000-00805f9b34fb
[CHG] Device 34:DF:2A:28:C2:7F UUIDs: 0000110b-0000-1000-8000-00805f9b34fb
[CHG] Device 34:DF:2A:28:C2:7F UUIDs: 0000110c-0000-1000-8000-00805f9b34fb
[CHG] Device 34:DF:2A:28:C2:7F UUIDs: 0000110e-0000-1000-8000-00805f9b34fb
[CHG] Device 34:DF:2A:28:C2:7F UUIDs: 0000111e-0000-1000-8000-00805f9b34fb
[CHG] Device 34:DF:2A:28:C2:7F UUIDs: 00001200-0000-1000-8000-00805f9b34fb
[CHG] Device 34:DF:2A:28:C2:7F ServicesResolved: yes
Failed to connect: org.bluez.Error.Failed
[CHG] Device 34:DF:2A:28:C2:7F ServicesResolved: no
[CHG] Device 34:DF:2A:28:C2:7F Connected: no
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$ sudo journalctl -u bluetooth
Jul 05 12:12:03 foo bluetoothd[22809]: 34:DF:2A:28:C2:7F: error updating services: Connection refused (111)
Jul 05 12:12:11 foo bluetoothd[22809]: Unable to get connect data for Headset Voice gateway: getpeername: Transport endpoint is not connected (107)
Jul 05 12:12:12 foo bluetoothd[22809]: connect error: Connection refused (111)
Jul 05 12:12:14 foo bluetoothd[22809]: connect error: Connection refused (111)
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$ yum list installed | grep -i blue
NetworkManager-bluetooth.x86_64 1:1.12.0-10.el7_6
blueberry.noarch 1.1.20-6.el7
bluedevil.x86_64 2.1-1.el7
bluez.x86_64 5.44-4.el7_4
bluez-cups.x86_64 5.44-4.el7_4
bluez-hid2hci.x86_64 5.44-4.el7_4
bluez-libs.x86_64 5.44-4.el7_4
bluez-libs-devel.x86_64 5.44-4.el7_4
bluez-tools.x86_64 0.2.0-0.7.git20170912.7cb788c.el7
gnome-bluetooth.x86_64 1:3.28.2-1.el7
gnome-bluetooth-libs.x86_64 1:3.28.2-1.el7
libbluedevil.x86_64 2.1-1.el7
pulseaudio-module-bluetooth.x86_64 10.0-5.el7
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$ hciconfig
hci0: Type: Primary Bus: USB
BD Address: D4:6D:6D:60:8B:E0 ACL MTU: 1021:4 SCO MTU: 96:6
UP RUNNING PSCAN ISCAN
RX bytes:116064 acl:110 sco:0 events:6018 errors:0
TX bytes:622857 acl:105 sco:0 commands:3409 errors:0
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$ sudo systemctl status bluetooth
● bluetooth.service - Bluetooth service
Loaded: loaded (/usr/lib/systemd/system/bluetooth.service; enabled; vendor preset: enabled)
Active: active (running) since Fri 2019-07-05 11:33:52 CEST; 46min ago
Docs: man:bluetoothd(8)
Main PID: 22809 (bluetoothd)
Status: "Running"
Tasks: 1
CGroup: /system.slice/bluetooth.service
└─22809 /usr/libexec/bluetooth/bluetoothd
Jul 05 11:47:46 foo bluetoothd[22809]: connect error: Connection refused (111)
Jul 05 11:47:49 foo bluetoothd[22809]: connect error: Connection refused (111)
Jul 05 11:48:58 foo bluetoothd[22809]: 34:DF:2A:28:C2:7F: error updating services: Connection refused (111)
Jul 05 11:49:02 foo bluetoothd[22809]: Unable to get connect data for Headset Voice gateway: getpeername: Transport endpoint is not ...ed (107)
Jul 05 11:49:02 foo bluetoothd[22809]: connect error: Connection refused (111)
Jul 05 11:49:05 foo bluetoothd[22809]: connect error: Connection refused (111)
Jul 05 12:12:03 foo bluetoothd[22809]: 34:DF:2A:28:C2:7F: error updating services: Connection refused (111)
Jul 05 12:12:11 foo bluetoothd[22809]: Unable to get connect data for Headset Voice gateway: getpeername: Transport endpoint is not ...ed (107)
Jul 05 12:12:12 foo bluetoothd[22809]: connect error: Connection refused (111)
Jul 05 12:12:14 foo bluetoothd[22809]: connect error: Connection refused (111)
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$ uname -a
Linux foo 5.1.16-1.el7.elrepo.x86_64 #1 SMP Wed Jul 3 10:53:38 EDT 2019 x86_64 x86_64 x86_64 GNU/Linux
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$ pactl list modules | grep -i name
Name: module-device-restore
Name: module-stream-restore
Name: module-card-restore
Name: module-augment-properties
Name: module-switch-on-connect
Name: module-udev-detect
Name: module-alsa-card
Argument: device_id="1" name="usb-Lenovo_ThinkPad_USB-C_Dock_Audio_000000000000-00-Audio" card_name="alsa_card.usb-Lenovo_ThinkPad_USB-C_Dock_Audio_000000000000-00-Audio" namereg_fail=false tsched=yes fixed_latency_range=no ignore_dB=no deferred_volume=yes use_ucm=yes card_properties="module-udev-detect.discovered=1"
Name: module-alsa-card
Argument: device_id="0" name="pci-0000_00_1f.3" card_name="alsa_card.pci-0000_00_1f.3" namereg_fail=false tsched=yes fixed_latency_range=no ignore_dB=no deferred_volume=yes use_ucm=yes card_properties="module-udev-detect.discovered=1"
Name: module-bluetooth-policy
Name: module-bluetooth-discover
Name: module-bluez5-discover
Name: module-esound-protocol-unix
Name: module-native-protocol-unix
Name: module-default-device-restore
Name: module-rescue-streams
Name: module-always-sink
Name: module-intended-roles
Name: module-suspend-on-idle
Name: module-systemd-login
Name: module-position-event-sounds
Name: module-role-cork
Name: module-filter-heuristics
Name: module-filter-apply
Name: module-x11-publish
Name: module-x11-cork-request
Name: module-x11-xsmp
Both my own user as well as the pulse user are member of the lp group.
I still have no clue how ALSA, PulseAudio and the bluetooth daemon work together.
Any hint appreciated.
