bluetooth connections are unstable with linux-image-6.5.0-6-generic and above (MANTIC)

[Derk Willem te Bokkel]

Seems some random network activity regularly breaks bluetooth connections.. headphones connect and reconnect or suffer breaks in sound etc.
Started with this kernel version linux-image-6.5.0-7 .. previous kernel linux-image-6.5.0-5 works perfectly
Booting into the older kernel restores bluetooth stability.

ProblemType: Bug
DistroRelease: Ubuntu 23.10
Package: linux-image-6.5.0-7-generic 6.5.0-7.7
ProcVersionSignature: Ubuntu 6.5.0-5.5-generic 6.5.0
Uname: Linux 6.5.0-5-generic x86_64
ApportVersion: 2.27.0-0ubuntu4
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: derk 1690 F.... wireplumber
 /dev/snd/controlC0: derk 1690 F.... wireplumber
 /dev/snd/seq: derk 1687 F.... pipewire
CRDA: N/A
CasperMD5CheckResult: pass
CurrentDesktop: XFCE
Date: Thu Oct 5 08:33:01 2023
InstallationDate: Installed on 2023-10-04 (1 days ago)
InstallationMedia: Xubuntu 23.10 "Mantic Minotaur" - Daily amd64 (20231004)
MachineType: {report['dmi.sys.vendor']} {report['dmi.product.name']}
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.5.0-5-generic root=UUID=1d40ce67-0e56-4531-a16f-817634fd450a ro quiet splash vt.handoff=7
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
 linux-restricted-modules-6.5.0-5-generic N/A
 linux-backports-modules-6.5.0-5-generic N/A
 linux-firmware 20230919.git3672ccab-0ubuntu2
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/13/2023
dmi.bios.release: 1.21
dmi.bios.vendor: LENOVO
dmi.bios.version: L9CN21WW
dmi.board.asset.tag: NO Asset Tag
dmi.board.name: LNVNB161216
dmi.board.vendor: LENOVO
dmi.board.version: SDK0T76463 WIN
dmi.chassis.asset.tag: NO Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: IdeaPad Slim 5 16ABR8
dmi.ec.firmware.release: 1.21
dmi.modalias: dmi:bvnLENOVO:bvrL9CN21WW:bd06/13/2023:br1.21:efr1.21:svnLENOVO:pn82XG:pvrIdeaPadSlim516ABR8:rvnLENOVO:rnLNVNB161216:rvrSDK0T76463WIN:cvnLENOVO:ct10:cvrIdeaPadSlim516ABR8:skuLENOVO_MT_82XG_BU_idea_FM_IdeaPadSlim516ABR8:
dmi.product.family: IdeaPad Slim 5 16ABR8
dmi.product.name: 82XG
dmi.product.sku: LENOVO_MT_82XG_BU_idea_FM_IdeaPad Slim 5 16ABR8
dmi.product.version: IdeaPad Slim 5 16ABR8
dmi.sys.vendor: LENOVO
---
ProblemType: Bug
ApportVersion: 2.27.0-0ubuntu5
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: derk 1691 F.... wireplumber
 /dev/snd/controlC0: derk 1691 F.... wireplumber
 /dev/snd/seq: derk 1688 F.... pipewire
CRDA: N/A
CasperMD5CheckResult: pass
CurrentDesktop: XFCE
DistroRelease: Ubuntu 23.10
InstallationDate: Installed on 2023-10-04 (12 days ago)
InstallationMedia: Xubuntu 23.10 "Mantic Minotaur" - Daily amd64 (20231004)
MachineType: {report['dmi.sys.vendor']} {report['dmi.product.name']}
Package: linux (not installed)
ProcEnviron:
 LANG=en_CA.UTF-8
 LANGUAGE=en_CA:en
 PATH=(custom, no user)
 SHELL=/bin/bash
 TERM=xterm-256color
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.5.0-9-generic root=UUID=1d40ce67-0e56-4531-a16f-817634fd450a ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 6.5.0-9.9-generic 6.5.3
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
 linux-restricted-modules-6.5.0-9-generic N/A
 linux-backports-modules-6.5.0-9-generic N/A
 linux-firmware 20230919.git3672ccab-0ubuntu2.1
Tags: mantic
Uname: Linux 6.5.0-9-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: N/A
_MarkForUpload: True
dmi.bios.date: 06/13/2023
dmi.bios.release: 1.21
dmi.bios.vendor: LENOVO
dmi.bios.version: L9CN21WW
dmi.board.asset.tag: NO Asset Tag
dmi.board.name: LNVNB161216
dmi.board.vendor: LENOVO
dmi.board.version: SDK0T76463 WIN
dmi.chassis.asset.tag: NO Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: IdeaPad Slim 5 16ABR8
dmi.ec.firmware.release: 1.21
dmi.modalias: dmi:bvnLENOVO:bvrL9CN21WW:bd06/13/2023:br1.21:efr1.21:svnLENOVO:pn82XG:pvrIdeaPadSlim516ABR8:rvnLENOVO:rnLNVNB161216:rvrSDK0T76463WIN:cvnLENOVO:ct10:cvrIdeaPadSlim516ABR8:skuLENOVO_MT_82XG_BU_idea_FM_IdeaPadSlim516ABR8:
dmi.product.family: IdeaPad Slim 5 16ABR8
dmi.product.name: 82XG
dmi.product.sku: LENOVO_MT_82XG_BU_idea_FM_IdeaPad Slim 5 16ABR8
dmi.product.version: IdeaPad Slim 5 16ABR8
dmi.sys.vendor: LENOVO

[Derk Willem te Bokkel (dtebokkel)]

did a whole fresh install to verify this .. initial kernel installed was 6.5.0-5 everything worked as expected .. upon upgrade to 6.5.0-7 the bluetooth connections became unstable ..

[Derk Willem te Bokkel (dtebokkel)]

this is for the development version .. Mantic daily iso xubuntu 10-05-2023

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

This change was made by a bot.

[Derk Willem te Bokkel (dtebokkel)]

FYI the linux-image-6.5.0-6-genric version also has the bluetooth random disconnect/reconnect issue..
(using kubuntu or xubuntu instances .. all on the same physical hardware .. all Mantic

[Juerg Haefliger (juergh)]

Can you please provide logs from when running the 'bad' kernel?

[Derk Willem te Bokkel (dtebokkel)]

logs from "bad kernel"

[Derk Willem te Bokkel (dtebokkel)]

next oldest

[Derk Willem te Bokkel (dtebokkel)]

kern.log today

[Derk Willem te Bokkel (dtebokkel)]

kern.log.1 yesterday

[Derk Willem te Bokkel (dtebokkel)]

auth.log

[Derk Willem te Bokkel (dtebokkel)]

boot.log

[Derk Willem te Bokkel (dtebokkel)]

boot.log.1

[Derk Willem te Bokkel (dtebokkel)]

I've been trying out new installs with bluetooth for the release candidate of xubuntu 23.10 and the latest linux-image-generic-6.5.0-9 .. the initial clean install with no browser used .. gave good bluetooth performance .. but while playing music through my bluetooth headphone I started firefox(snap based) and bluetooth performance deteriorated rapidly.. and disconnect/reconnects started occuring.. as firefox activity on the network progressed .. even firefox snap running in the background caused the interference ..

[Derk Willem te Bokkel (dtebokkel)]

okay .. it does not matter which snap or binary forefire browser or even thunderbird network activity for all 6.5.0-6 and greater kernels cause dropouts bluetooth audio noise and disconnect/reconnect behaviour..
kernels less than or equal to 6.5.0-5 do not exhibit this behaviour..

sometimes even window moves or selection of these apps causes issues..

It is as if there is an bluetooth audio/network bus bandwith/or interfereance issue created in the newer kernels

[Derk Willem te Bokkel (dtebokkel)]

added bug report with ubuntu-bug with data from 6.5.0-9 kernel version bug#2039358

[Juerg Haefliger (juergh)]

Is bug 2039358 a different issue or why did you open a new bug?

[Derk Willem te Bokkel (dtebokkel)]

I wanted to make sure I had all the info needed pulled in .. it is the same issue .. is there a way to use ubuntu-bug to add info to an existing bug?

have I missed any logs you need for analysis?

[Derk Willem te Bokkel (dtebokkel)]

oh I just saw that apport-collect is used for that.. sorry for the noise

[Derk Willem te Bokkel (dtebokkel)]

apport information

[Derk Willem te Bokkel (dtebokkel)]

apport information

[Derk Willem te Bokkel (dtebokkel)]

apport information

[Derk Willem te Bokkel (dtebokkel)]

apport information

[Derk Willem te Bokkel (dtebokkel)]

apport information

[Derk Willem te Bokkel (dtebokkel)]

apport information

[Derk Willem te Bokkel (dtebokkel)]

apport information

[Derk Willem te Bokkel (dtebokkel)]

apport information

[Derk Willem te Bokkel (dtebokkel)]

apport information

[Derk Willem te Bokkel (dtebokkel)]

apport information

[Derk Willem te Bokkel (dtebokkel)]

apport information

[Derk Willem te Bokkel (dtebokkel)]

apport information

[Derk Willem te Bokkel (dtebokkel)]

apport information

[Derk Willem te Bokkel (dtebokkel)]

apport information

[Derk Willem te Bokkel (dtebokkel)]

apport information

[Derk Willem te Bokkel (dtebokkel)]

apport information

[Derk Willem te Bokkel (dtebokkel)]

apport information

[Derk Willem te Bokkel (dtebokkel)]

Okay the above represents apport-collection fron a linux-image-6.5.0-9-generic kernel instance .. after bluetooth headphone connection and at least two connection and disconnect insidents.. two firefox browser start and stops at least

any thing else needed..?

[Derk Willem te Bokkel (dtebokkel)]

intermittent behaviour still present in 6.5.0-10 .. just installed .. but disconnects are less frequent.
audio drop-outs are frequent.. tracks play normally with linux-image-6.5.0-5 .. manually marked .. to prevent removal..

[Derk Willem te Bokkel (dtebokkel)]

FYI a test install of fedora 39beta upgraded to latest vmlinuz-6.5.9-300.fc39.x86_64 kernel has no bluetooth audio issues .. on the same hardware .. different partions only..

[Ubuntu QA Website (ubuntuqa)]

This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:
https://iso.qa.ubuntu.com/qatracker/reports/bugs/2038539

[Derk Willem te Bokkel (dtebokkel)]

note: disconnecting from the network stops dropouts considerably to a much more tolerable level.

I tried using flight mode but that kills bluetooth as well and turning it on again resulted in a struggle to reconnect the headphones. ..

as a side note .. latest audio updates had just been installed .. so no change in the underlying problem ..

 definite interaction with regular network causes the problem .. a traffic direction/priority issue?

[Derk Willem te Bokkel (dtebokkel)]

comment #41 was with the 6.5.0-12 kernel version .. switching to the older 6.5.0-5 kernel there are no issues (same software/hardware/just a reboot to a different kernel)

.. so a definite kernel internal interaction appears indicated between regular network and bluetooth network .. regular networking priority higher than bluetooth? or a device driver change? I don't know enough to check this out ..

[Derk Willem te Bokkel (dtebokkel)]

just did another fresh noble xubuntu daily install .. 11/14/2023 bluetooth sound is jittery .. even without a browser started..vmlinux-6.5.0-9-generic .. is on the install media..

[Juerg Haefliger (juergh)]

There are a lot of stable and apparmor updates that went into 6.5.0-7. Can you identify any kernel or system log events at the (exact) time when the disconnects/dropouts happen?

[Derk Willem te Bokkel (dtebokkel)]

tried tail -f /var/log/syslog -f /var/log/kern.log ..

nothing syncronizes with the sound glitchers although a regular event is

==> /var/log/syslog <==
2023-11-15T13:17:48.973884-05:00 zlite1c kernel: [ 938.056939] audit: type=1400 audit(1700072268.965:142): apparmor="DENIED" operation="open" class="file" profile="/usr/sbin/cups-browsed" name="/etc/gnutls/config" pid=3446 comm="ippfind" requested_mask="r" denied_mask="r" fsuid=118 ouid=0

==> /var/log/kern.log <==
2023-11-15T13:17:48.973884-05:00 zlite1c kernel: [ 938.056939] audit: type=1400 audit(1700072268.965:142): apparmor="DENIED" operation="open" class="file" profile="/usr/sbin/cups-browsed" name="/etc/gnutls/config" pid=3446 comm="ippfind" requested_mask="r" denied_mask="r" fsuid=118 ouid=0

This appeared once:

==> /var/log/syslog <==
2023-11-15T13:12:29.271897-05:00 zlite1c systemd[1737]: blueman-manager.service: Consumed 8.608s CPU time.
2023-11-15T13:12:33.253214-05:00 zlite1c kernel: [ 622.336703] audit: type=1400 audit(1700071953.246:134): apparmor="DENIED" operation="open" class="file" profile="/usr/sbin/cups-browsed" name="/etc/gnutls/config" pid=3338 comm="ippfind" requested_mask="r" denied_mask="r" fsuid=118 ouid=0

But did not correspond to a sound drop/glitch..

[Derk Willem te Bokkel (dtebokkel)]

the apparmor lines above are also present using the 6.5.0-5 kernel which does NOT have glitches .. so that's a red herring ..

[Derk Willem te Bokkel (dtebokkel)]

upgrade to kernel 6.6.0-13 slightly lessens the problem but does not eliminate the drop outs again starting browsing seems to trigger drop out to begin.. scheduler issue?

[Derk Willem te Bokkel (dtebokkel)]

no change with kernel 6.6.0-14

[Derk Willem te Bokkel (dtebokkel)]

All on the same hardware .. just different install paritions..

a manjaro install with kernel 6.6.7 has no bluetooth issues even though the latest Ubuntu 6.6.0-14-generic kernel still has bluetooth dropouts .. up to date nobel install .. same install parition running 6.5.0-5-generic kernel no bluetooth drop out issues .. something in the recent ubuntu customized kernel is amiss!

[Derk Willem te Bokkel (dtebokkel)]

okay installed kernel 6.8.0-7 from noble-proposed and bluetooth issue is gone with this version.. no drops
so this appears fixed