Comment 0 for bug 1971632

On a fresh install of Kubuntu 22.04, when I turn my properly paired bluetooth headphones on they automatically connect to the system, then immediately disconnect again. The headphones thus have to be manually 're-connected' every time.

Best as I understand it from the logs (appended below), pulseaudio showing up killed just after the headphones turn up as an unregistered sender ...
4/30/22 7:33 PM systemd pulseaudio.service: Main process exited, code=killed, status=8/FPE

... is responsible for the observed problem, i.e. the disconnect, probably triggered when pulseaudio restarts ...
4/30/22 7:33 PM systemd pulseaudio.service: Scheduled restart job, restart counter is at 2.

So it seems either an internal pulseaudio problem, or a problem triggered by the division by 0 in the bluetooth module ...
4/30/22 7:33 PM kernel traps: bluetooth[8884] trap divide error ip:7f862dc68490 sp:7f862498cc30 error:0 in module-bluez5-device.so[7f862dc66000+9000]

or some combination of the two ... but again, I'm only guessing here.

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System Logs after switching headphones on:

4/30/22 7:33 PM kernel input: Nat's Flex (AVRCP) as /devices/virtual/input/input31
4/30/22 7:33 PM systemd-logind Watching system buttons on /dev/input/event19 (Nat's Flex (AVRCP))
4/30/22 7:33 PM bluetoothd /org/bluez/hci0/dev_A8_91_3D_DF_A8_F4/fd3: fd(43) ready
4/30/22 7:33 PM rtkit-daemon Supervising 0 threads of 0 processes of 0 users.
4/30/22 7:33 PM rtkit-daemon Successfully made thread 8884 of process 3426 owned by '1000' RT at priority 5.
4/30/22 7:33 PM rtkit-daemon Supervising 1 threads of 1 processes of 1 users.
4/30/22 7:33 PM kernel traps: bluetooth[8884] trap divide error ip:7f862dc68490 sp:7f862498cc30 error:0 in module-bluez5-device.so[7f862dc66000+9000]
4/30/22 7:33 PM bluetoothd Endpoint unregistered: sender=:1.126 path=/MediaEndpoint/A2DPSink/sbc
4/30/22 7:33 PM bluetoothd Endpoint unregistered: sender=:1.126 path=/MediaEndpoint/A2DPSource/sbc
4/30/22 7:33 PM bluetoothd Endpoint unregistered: sender=:1.126 path=/MediaEndpoint/A2DPSink/sbc_xq_453
4/30/22 7:33 PM bluetoothd Endpoint unregistered: sender=:1.126 path=/MediaEndpoint/A2DPSource/sbc_xq_453
4/30/22 7:33 PM bluetoothd Endpoint unregistered: sender=:1.126 path=/MediaEndpoint/A2DPSink/sbc_xq_512
4/30/22 7:33 PM bluetoothd Endpoint unregistered: sender=:1.126 path=/MediaEndpoint/A2DPSource/sbc_xq_512
4/30/22 7:33 PM bluetoothd Endpoint unregistered: sender=:1.126 path=/MediaEndpoint/A2DPSink/sbc_xq_552
4/30/22 7:33 PM systemd pulseaudio.service: Main process exited, code=killed, status=8/FPE
4/30/22 7:33 PM bluetoothd Endpoint unregistered: sender=:1.126 path=/MediaEndpoint/A2DPSource/sbc_xq_552
4/30/22 7:33 PM systemd pulseaudio.service: Failed with result 'signal'.
4/30/22 7:33 PM systemd pulseaudio.service: Consumed 2min 20.027s CPU time.
4/30/22 7:33 PM acpid input device has been disconnected, fd 20
4/30/22 7:33 PM systemd pulseaudio.service: Scheduled restart job, restart counter is at 2.
4/30/22 7:33 PM systemd Stopped Sound Service.
4/30/22 7:33 PM systemd pulseaudio.service: Consumed 2min 20.027s CPU time.
4/30/22 7:33 PM systemd Starting Sound Service...
4/30/22 7:33 PM rtkit-daemon Successfully made thread 8889 of process 8889 owned by '1000' high priority at nice level -11.
4/30/22 7:33 PM rtkit-daemon Supervising 1 threads of 1 processes of 1 users.
4/30/22 7:33 PM pulseaudio Stale PID file, overwriting.
4/30/22 7:33 PM rtkit-daemon Supervising 1 threads of 1 processes of 1 users.
4/30/22 7:33 PM rtkit-daemon Successfully made thread 8890 of process 8889 owned by '1000' RT at priority 5.
4/30/22 7:33 PM rtkit-daemon Supervising 2 threads of 1 processes of 1 users.
4/30/22 7:33 PM rtkit-daemon Supervising 2 threads of 1 processes of 1 users.
4/30/22 7:33 PM rtkit-daemon Successfully made thread 8891 of process 8889 owned by '1000' RT at priority 5.
4/30/22 7:33 PM rtkit-daemon Supervising 3 threads of 1 processes of 1 users.
4/30/22 7:33 PM systemd Started Sound Service.
4/30/22 7:33 PM pulseaudio Could not find org.bluez.BatteryProviderManager1.RegisterBatteryProvider(), is bluetoothd started with experimental features enabled (-E flag)?
4/30/22 7:33 PM bluetoothd Endpoint registered: sender=:1.246 path=/MediaEndpoint/A2DPSink/sbc
4/30/22 7:33 PM bluetoothd Endpoint registered: sender=:1.246 path=/MediaEndpoint/A2DPSource/sbc
4/30/22 7:33 PM bluetoothd Endpoint registered: sender=:1.246 path=/MediaEndpoint/A2DPSink/sbc_xq_453
4/30/22 7:33 PM bluetoothd Endpoint registered: sender=:1.246 path=/MediaEndpoint/A2DPSource/sbc_xq_453
4/30/22 7:33 PM bluetoothd Endpoint registered: sender=:1.246 path=/MediaEndpoint/A2DPSink/sbc_xq_512
4/30/22 7:33 PM bluetoothd Endpoint registered: sender=:1.246 path=/MediaEndpoint/A2DPSource/sbc_xq_512
4/30/22 7:33 PM bluetoothd Endpoint registered: sender=:1.246 path=/MediaEndpoint/A2DPSink/sbc_xq_552
4/30/22 7:33 PM bluetoothd Endpoint registered: sender=:1.246 path=/MediaEndpoint/A2DPSource/sbc_xq_552

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: pulseaudio 1:15.99.1+dfsg1-1ubuntu1
ProcVersionSignature: Ubuntu 5.15.0-27.28-generic 5.15.30
Uname: Linux 5.15.0-27-generic x86_64
ApportVersion: 2.20.11-0ubuntu82
Architecture: amd64
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/controlC0', '/dev/snd/hwC0D2', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D10p', '/dev/snd/pcmC0D9p', '/dev/snd/pcmC0D8p', '/dev/snd/pcmC0D7p', '/dev/snd/pcmC0D3p', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
CasperMD5CheckResult: unknown
CurrentDesktop: KDE
Date: Wed May 4 17:46:37 2022
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
SourcePackage: pulseaudio
Symptom: audio
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 03/25/2022
dmi.bios.release: 1.14
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.14.0
dmi.board.name: 05XYW7
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr1.14.0:bd03/25/2022:br1.14:svnDellInc.:pnXPS159500:pvr:rvnDellInc.:rn05XYW7:rvrA00:cvnDellInc.:ct10:cvr:sku097D:
dmi.product.family: XPS
dmi.product.name: XPS 15 9500
dmi.product.sku: 097D
dmi.sys.vendor: Dell Inc.
modified.conffile..etc.pulse.daemon.conf: [modified]
mtime.conffile..etc.pulse.daemon.conf: 2022-04-29T21:03:20.101513