[0cf3:e301 Qualcomm Atheros]Cannot switch to A2DP profile w/o restarting bluetooth.service [pulseaudio: Refused to switch profile to a2dp_sink: Not connected]

[Kyrylo Bohdanenko]

When connecting to any Bluetooth device, PulseAudio fails to change its profile to A2DP (and leaves it in HSP/HFP).

The following is appended to /var/log/syslog when trying to change profile in pavucontrol:

Aug 14 14:59:02 k-laptop pulseaudio[18882]: Refused to switch profile to a2dp_sink: Not connected

I'm currently using patched pulseaudio-modules-bt from here: https://github.com/EHfive/pulseaudio-modules-bt. But the problem persists with both packages.

The working workaround I found is:

  sudo systemctl restart bluetooth.service
  bluetoothctl

    # list device MACs
    devices

    # use a MAC from the list above
    connect <MAC>

After doing this, it is possible to switch to A2DP profile in pavucontrol. But such restart is required each time device is connected.

I'm using
Kubuntu 20.10 (development branch)
pulseaudio: 1:13.99.1-1ubuntu8
pulseaudio-modules-bluetooth: 1:13.99.1-1ubuntu8-9git+20200812~dfeee4f
  but also reproducible with 1:13.99.1-1ubuntu8

ProblemType: Bug
DistroRelease: Ubuntu 20.10
Package: pulseaudio 1:13.99.1-1ubuntu8
ProcVersionSignature: Ubuntu 5.4.0-43.47-generic 5.4.55
Uname: Linux 5.4.0-43-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu44
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: kyrboh 19544 F.... pulseaudio
 /dev/snd/pcmC0D0c: kyrboh 19544 F...m pulseaudio
 /dev/snd/pcmC0D0p: kyrboh 19544 F...m pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: KDE
Date: Fri Aug 14 15:06:43 2020
InstallationDate: Installed on 2020-08-07 (6 days ago)
InstallationMedia: Kubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
SourcePackage: pulseaudio
UpgradeStatus: Upgraded to groovy on 2020-08-10 (3 days ago)
dmi.bios.date: 05/22/2020
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.19.2
dmi.board.name: 05FFDN
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr1.19.2:bd05/22/2020:svnDellInc.:pnXPS159560:pvr:rvnDellInc.:rn05FFDN:rvrA00:cvnDellInc.:ct10:cvr:
dmi.product.family: XPS
dmi.product.name: XPS 15 9560
dmi.product.sku: 07BE
dmi.sys.vendor: Dell Inc.
---
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu44
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: kyrboh 1062 F.... pulseaudio
 /dev/snd/pcmC0D0c: kyrboh 1062 F...m pulseaudio
 /dev/snd/pcmC0D0p: kyrboh 1062 F...m pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: KDE
DistroRelease: Ubuntu 20.10
InstallationDate: Installed on 2020-08-07 (12 days ago)
InstallationMedia: Kubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
MachineType: Dell Inc. XPS 15 9560
NonfreeKernelModules: nvidia_modeset nvidia
Package: linux (not installed)
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-43-generic root=UUID=9aa54552-f644-480c-acac-bd2259bcc1df ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 5.4.0-43.47-generic 5.4.55
RelatedPackageVersions:
 linux-restricted-modules-5.4.0-43-generic N/A
 linux-backports-modules-5.4.0-43-generic N/A
 linux-firmware 1.189
Tags: wayland-session groovy
Uname: Linux 5.4.0-43-generic x86_64
UpgradeStatus: Upgraded to groovy on 2020-08-10 (9 days ago)
UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 05/22/2020
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.19.2
dmi.board.name: 05FFDN
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr1.19.2:bd05/22/2020:svnDellInc.:pnXPS159560:pvr:rvnDellInc.:rn05FFDN:rvrA00:cvnDellInc.:ct10:cvr:
dmi.product.family: XPS
dmi.product.name: XPS 15 9560
dmi.product.sku: 07BE
dmi.sys.vendor: Dell Inc.
---
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu44
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: kyrboh 984 F.... pulseaudio
 /dev/snd/pcmC0D0c: kyrboh 984 F...m pulseaudio
 /dev/snd/pcmC0D0p: kyrboh 984 F...m pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: KDE
CurrentDmesg: Error: command ['dmesg'] failed with exit code 1: dmesg: read kernel buffer failed: Operation not permitted
DistroRelease: Ubuntu 20.10
InstallationDate: Installed on 2020-08-07 (19 days ago)
InstallationMedia: Kubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
MachineType: Dell Inc. XPS 15 9560
NonfreeKernelModules: nvidia_modeset nvidia
Package: linux (not installed)
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.8.0-16-generic root=UUID=9aa54552-f644-480c-acac-bd2259bcc1df ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 5.8.0-16.17-generic 5.8.0
RelatedPackageVersions:
 linux-restricted-modules-5.8.0-16-generic N/A
 linux-backports-modules-5.8.0-16-generic N/A
 linux-firmware 1.190
Tags: wayland-session groovy
Uname: Linux 5.8.0-16-generic x86_64
UpgradeStatus: Upgraded to groovy on 2020-08-10 (16 days ago)
UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 05/22/2020
dmi.bios.release: 1.19
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.19.2
dmi.board.name: 05FFDN
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr1.19.2:bd05/22/2020:br1.19:svnDellInc.:pnXPS159560:pvr:rvnDellInc.:rn05FFDN:rvrA00:cvnDellInc.:ct10:cvr:
dmi.product.family: XPS
dmi.product.name: XPS 15 9560
dmi.product.sku: 07BE
dmi.sys.vendor: Dell Inc.
---
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu44
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: kyrboh 980 F.... pulseaudio
 /dev/snd/pcmC0D0c: kyrboh 980 F...m pulseaudio
 /dev/snd/pcmC0D0p: kyrboh 980 F...m pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: KDE
CurrentDmesg: Error: command ['dmesg'] failed with exit code 1: dmesg: read kernel buffer failed: Operation not permitted
DistroRelease: Ubuntu 20.10
InstallationDate: Installed on 2020-08-07 (19 days ago)
InstallationMedia: Kubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
MachineType: Dell Inc. XPS 15 9560
NonfreeKernelModules: nvidia_modeset nvidia
Package: linux (not installed)
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.8.0-16-generic root=UUID=9aa54552-f644-480c-acac-bd2259bcc1df ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 5.8.0-16.17-generic 5.8.0
RelatedPackageVersions:
 linux-restricted-modules-5.8.0-16-generic N/A
 linux-backports-modules-5.8.0-16-generic N/A
 linux-firmware 1.190
Tags: wayland-session groovy
Uname: Linux 5.8.0-16-generic x86_64
UpgradeStatus: Upgraded to groovy on 2020-08-10 (16 days ago)
UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 05/22/2020
dmi.bios.release: 1.19
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.19.2
dmi.board.name: 05FFDN
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr1.19.2:bd05/22/2020:br1.19:svnDellInc.:pnXPS159560:pvr:rvnDellInc.:rn05FFDN:rvrA00:cvnDellInc.:ct10:cvr:
dmi.product.family: XPS
dmi.product.name: XPS 15 9560
dmi.product.sku: 07BE
dmi.sys.vendor: Dell Inc.
---
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu45
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: kyrboh 1005 F.... pulseaudio
 /dev/snd/pcmC0D0c: kyrboh 1005 F...m pulseaudio
 /dev/snd/pcmC0D0p: kyrboh 1005 F...m pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: KDE
CurrentDmesg: Error: command ['dmesg'] failed with exit code 1: dmesg: read kernel buffer failed: Operation not permitted
DistroRelease: Ubuntu 20.10
InstallationDate: Installed on 2020-08-07 (23 days ago)
InstallationMedia: Kubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
MachineType: Dell Inc. XPS 15 9560
NonfreeKernelModules: nvidia_modeset nvidia
Package: linux (not installed)
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.8.0-16-generic root=UUID=9aa54552-f644-480c-acac-bd2259bcc1df ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 5.8.0-16.17-generic 5.8.0
RelatedPackageVersions:
 linux-restricted-modules-5.8.0-16-generic N/A
 linux-backports-modules-5.8.0-16-generic N/A
 linux-firmware 1.190
Tags: wayland-session groovy
Uname: Linux 5.8.0-16-generic x86_64
UpgradeStatus: Upgraded to groovy on 2020-08-10 (20 days ago)
UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 05/22/2020
dmi.bios.release: 1.19
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.19.2
dmi.board.name: 05FFDN
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr1.19.2:bd05/22/2020:br1.19:svnDellInc.:pnXPS159560:pvr:rvnDellInc.:rn05FFDN:rvrA00:cvnDellInc.:ct10:cvr:
dmi.product.family: XPS
dmi.product.name: XPS 15 9560
dmi.product.sku: 07BE
dmi.sys.vendor: Dell Inc.
---
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu45
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: kyrboh 994 F.... pulseaudio
 /dev/snd/pcmC0D0c: kyrboh 994 F...m pulseaudio
 /dev/snd/pcmC0D0p: kyrboh 994 F...m pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: KDE
CurrentDmesg: Error: command ['dmesg'] failed with exit code 1: dmesg: read kernel buffer failed: Operation not permitted
DistroRelease: Ubuntu 20.10
InstallationDate: Installed on 2020-08-07 (23 days ago)
InstallationMedia: Kubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
MachineType: Dell Inc. XPS 15 9560
NonfreeKernelModules: nvidia_modeset nvidia
Package: linux (not installed)
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.8.0-16-generic root=UUID=9aa54552-f644-480c-acac-bd2259bcc1df ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 5.8.0-16.17-generic 5.8.0
RelatedPackageVersions:
 linux-restricted-modules-5.8.0-16-generic N/A
 linux-backports-modules-5.8.0-16-generic N/A
 linux-firmware 1.190
Tags: wayland-session groovy
Uname: Linux 5.8.0-16-generic x86_64
UpgradeStatus: Upgraded to groovy on 2020-08-10 (20 days ago)
UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 05/22/2020
dmi.bios.release: 1.19
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.19.2
dmi.board.name: 05FFDN
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr1.19.2:bd05/22/2020:br1.19:svnDellInc.:pnXPS159560:pvr:rvnDellInc.:rn05FFDN:rvrA00:cvnDellInc.:ct10:cvr:
dmi.product.family: XPS
dmi.product.name: XPS 15 9560
dmi.product.sku: 07BE
dmi.sys.vendor: Dell Inc.
---
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu45
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: kyrboh 994 F.... pulseaudio
 /dev/snd/pcmC0D0c: kyrboh 994 F...m pulseaudio
 /dev/snd/pcmC0D0p: kyrboh 994 F...m pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: KDE
CurrentDmesg: Error: command ['dmesg'] failed with exit code 1: dmesg: read kernel buffer failed: Operation not permitted
DistroRelease: Ubuntu 20.10
InstallationDate: Installed on 2020-08-07 (23 days ago)
InstallationMedia: Kubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
MachineType: Dell Inc. XPS 15 9560
NonfreeKernelModules: nvidia_modeset nvidia
Package: linux (not installed)
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.8.0-16-generic root=UUID=9aa54552-f644-480c-acac-bd2259bcc1df ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 5.8.0-16.17-generic 5.8.0
RelatedPackageVersions:
 linux-restricted-modules-5.8.0-16-generic N/A
 linux-backports-modules-5.8.0-16-generic N/A
 linux-firmware 1.190
Tags: wayland-session groovy
Uname: Linux 5.8.0-16-generic x86_64
UpgradeStatus: Upgraded to groovy on 2020-08-10 (20 days ago)
UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 05/22/2020
dmi.bios.release: 1.19
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.19.2
dmi.board.name: 05FFDN
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr1.19.2:bd05/22/2020:br1.19:svnDellInc.:pnXPS159560:pvr:rvnDellInc.:rn05FFDN:rvrA00:cvnDellInc.:ct10:cvr:
dmi.product.family: XPS
dmi.product.name: XPS 15 9560
dmi.product.sku: 07BE
dmi.sys.vendor: Dell Inc.

[Kyrylo Bohdanenko (kyrboh)]

Found this bug report on kernel's bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=204765

There are bluetooth-related entries from journalctl -x:

sie 18 21:14:25 k-laptop bluetoothd[11444]: RFCOMM server failed for Headset Voice gateway: rfcomm_bind: Address already in use (98)
sie 18 21:14:25 k-laptop bluetoothd[11444]: RFCOMM server failed for :1.36/Profile/HSPHSProfile/00001108-0000-1000-8000-00805f9b34fb: rfcomm_bind: Address already in use (98)
sie 18 21:14:25 k-laptop dbus-daemon[655]: [system] Successfully activated service 'org.freedesktop.hostname1'
sie 18 21:14:25 k-laptop kernel: debugfs: File 'le_min_key_size' in directory 'hci0' already present!
sie 18 21:14:25 k-laptop kernel: debugfs: File 'le_max_key_size' in directory 'hci0' already present!

I do have similar symptoms, so it might be the bug. Since Groovy's kernel version is 5.4, has the fix been backported?

[Kyrylo Bohdanenko (kyrboh)]

One more update. Using mainline kernel v5.8.1 from here: https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.8.1/

There is a definite improvement in connectivity. However, the originally reported issue is still there, and I am getting these in my /var/log/syslog (w/ custom pulseaudio-module-bluetooth):

sie 18 21:43:01 k-laptop pulseaudio[921]: Refused to switch profile to a2dp_sink_ldac: Not connected
sie 18 21:43:13 k-laptop pulseaudio[921]: Refused to switch profile to a2dp_sink_sbc: Not connected
sie 18 21:43:16 k-laptop pulseaudio[921]: Refused to switch profile to a2dp_sink_ldac: Not connected

[Daniel van Vugt (vanvugt)]

Those are different profiles "ldac" and "sbc", so are actually different bugs to this. I suggest logging those as new bugs after 5.8.0 becomes the standard kernel in groovy (soon). If they are bugs at all (ie. you are sure your headphones support LDAC and SBC).

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1891648

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Kyrylo Bohdanenko (kyrboh)]

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[Kyrylo Bohdanenko (kyrboh)]

These additional A2DP profiles are provided by the patched pulseaudio-modules-bt available here: https://github.com/EHfive/pulseaudio-modules-bt

Regular pulseaudio-module-bluetooth from Groovy has only SBC codec for A2DP profile (so there's no need to differentiate). However, even when I use the package from Groovy repositories, the same error happens, but the message is as listed in the description

pulseaudio: Refused to switch profile to a2dp_sink: Not connected

But instead, with the patched version it has more codecs, so there are more profiles like a2dp_sink_ldac or a2dp_sink_sbc.

The bluetooth headphones that I am using are Sony WH-1000XM4. These are supposed to support SBC and LDAC. Especially considering that LDAC is Sony's "invention".

Side Note:

libldac is build using source code from Android: https://android.googlesource.com/platform/external/libldac/

There is a PPA that provides binaries (libldac and patched pulseaudio-modules-bt): https://launchpad.net/~berglh/+archive/ubuntu/pulseaudio-a2dp

I think it would be nice to have these in Ubuntu repositories as well...

[Daniel van Vugt (vanvugt)]

Yes LDAC support sounds like a good idea. I can't find any existing bugs covering that so please open a new one against either pulseaudio or bluez requesting it.

[Daniel van Vugt (vanvugt)]

And to avoid all confusion and save time, please report such bugs from a machine not using any modified packages.

[Kyrylo Bohdanenko (kyrboh)]

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[Kyrylo Bohdanenko (kyrboh)]

Okay, so these logs above were collected after connecting Sony WH-1000XM2 headphones to the ASUS adapter (using pulseaudio-module-bluetooth/groovy)

[Kyrylo Bohdanenko (kyrboh)]

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[Kyrylo Bohdanenko (kyrboh)]

And these logs are after connecting to a JBL Xtreme bluetooth speaker.

[Kyrylo Bohdanenko (kyrboh)]

Since some recent updates the issue seems to have disappeared. I'll keep observing, and close the report by the end of the next week if the issue would not occur during this time.

[Kyrylo Bohdanenko (kyrboh)]

The issue is no longer reproducible.