Lot of "hci0 sco packet for unknown connection handle"
A message that is not in the archive (sent off-list or not yet received): [email protected]/
https://bugzilla.kernel.org/show_bug.cgi?id=80791
Nadia Yvette Chambers <[email protected]> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |nadia.yvette.chambers@gmail
| |.com--- Comment #1 from Nadia Yvette Chambers <[email protected]> --- I can reproduce this on a Lenovo x100e on 3.16.0-rc6 plus some git.
Signature · 2 lines
You are receiving this mail because: You are the assignee for the bug.
https://bugzilla.kernel.org/show_bug.cgi?id=80791
--- Comment #4 from Artem S. Tashkinov ([email protected]) --- This is still relevant as of 6.4.14.
There's absolutely no need to log this message more than once or ever.
The kernel doesn't log TCP packets being dropped/lost/whatever.
There's no need to log bluetooth's packets either unless debugging has been enabled.
Signature · 4 lines
You may reply to this email to add a comment. You are receiving this mail because: You are the assignee for the bug.
https://bugzilla.kernel.org/show_bug.cgi?id=80791
Artem S. Tashkinov ([email protected]) changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |[email protected]
--- Comment #2 from Artem S. Tashkinov ([email protected]) --- *** Bug 85161 has been marked as a duplicate of this bug. ***
Signature · 4 lines
You may reply to this email to add a comment. You are receiving this mail because: You are the assignee for the bug.
https://bugzilla.kernel.org/show_bug.cgi?id=80791
--- Comment #3 from Artem S. Tashkinov ([email protected]) --- *** Bug 90151 has been marked as a duplicate of this bug. ***
Signature · 4 lines
You may reply to this email to add a comment. You are receiving this mail because: You are the assignee for the bug.
https://bugzilla.kernel.org/show_bug.cgi?id=80791
Artem S. Tashkinov ([email protected]) changed:
What |Removed |Added
----------------------------------------------------------------------------
Kernel Version|3.0.35 |GIT
Signature · 4 lines
You may reply to this email to add a comment. You are receiving this mail because: You are the assignee for the bug.
[Bug 80791] "Bluetooth: hci0: ACL packet for unknown connection handle" must be hidden behind "debug"
In reply to a message not in the archivehttps://bugzilla.kernel.org/show_bug.cgi?id=80791
Artem S. Tashkinov ([email protected]) changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|Lot of "hci0 sco packet for |"Bluetooth: hci0: ACL
|unknown connection handle" |packet for unknown
| |connection handle" must be
| |hidden behind "debug"Signature · 4 lines
You may reply to this email to add a comment. You are receiving this mail because: You are the assignee for the bug.
https://bugzilla.kernel.org/show_bug.cgi?id=80791
--- Comment #5 from Artem S. Tashkinov ([email protected]) --- In 6.4 the message is slightly different:
Aug 28 11:13:15 hp kernel: Bluetooth: hci0: ACL packet for unknown connection
handle 3837
| wc -l -> 25 for August 28 alone.
Signature · 4 lines
You may reply to this email to add a comment. You are receiving this mail because: You are the assignee for the bug.
[Bug 80791] "Bluetooth: hci0: ACL packet for unknown connection handle" must be hidden behind "debug"
In reply to a message not in the archivehttps://bugzilla.kernel.org/show_bug.cgi?id=80791
Artem S. Tashkinov ([email protected]) changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |[email protected]
--- Comment #6 from Artem S. Tashkinov ([email protected]) --- Luiz,
Could you look into this please?
Signature · 4 lines
You may reply to this email to add a comment. You are receiving this mail because: You are the assignee for the bug.
[Bug 80791] "Bluetooth: hci0: ACL packet for unknown connection handle" must be hidden behind "debug"
In reply to a message not in the archivehttps://bugzilla.kernel.org/show_bug.cgi?id=80791
Artem S. Tashkinov ([email protected]) changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |[email protected]
--- Comment #7 from Artem S. Tashkinov ([email protected]) ---
When connecting my laptop to my smartphone I get this message almost every 2 seconds.
I don't think the user can even do anything about it, could you please show it _just once_?
[278536.979041] input: Smartphone X (AVRCP) as /devices/virtual/input/input20 [278557.775313] Bluetooth: hci0: ACL packet for unknown connection handle 3837 [278573.330987] Bluetooth: hci0: ACL packet for unknown connection handle 3837 [278574.837013] Bluetooth: hci0: ACL packet for unknown connection handle 3837 [278577.025169] Bluetooth: hci0: ACL packet for unknown connection handle 3837 [278579.533122] Bluetooth: hci0: ACL packet for unknown connection handle 3837 [278587.617396] Bluetooth: hci0: ACL packet for unknown connection handle 3837 [278601.656461] Bluetooth: hci0: ACL packet for unknown connection handle 3837 [278603.847227] Bluetooth: hci0: ACL packet for unknown connection handle 3837 [278605.494469] Bluetooth: hci0: ACL packet for unknown connection handle 3837 [278607.640811] Bluetooth: hci0: ACL packet for unknown connection handle 3837 [278609.998596] Bluetooth: hci0: ACL packet for unknown connection handle 3837 [278611.898942] Bluetooth: hci0: ACL packet for unknown connection handle 3837 [278626.172392] Bluetooth: hci0: ACL packet for unknown connection handle 3837 [278627.966819] Bluetooth: hci0: ACL packet for unknown connection handle 3837 [278630.108002] Bluetooth: hci0: ACL packet for unknown connection handle 3837 [278634.449240] Bluetooth: hci0: ACL packet for unknown connection handle 3837 [278637.205311] Bluetooth: hci0: ACL packet for unknown connection handle 3837 [278639.417526] Bluetooth: hci0: ACL packet for unknown connection handle 3837 [278650.205987] Bluetooth: hci0: ACL packet for unknown connection handle 3837 [278651.664703] Bluetooth: hci0: ACL packet for unknown connection handle 3837 [278659.509455] Bluetooth: hci0: ACL packet for unknown connection handle 3837 [278661.063814] Bluetooth: hci0: ACL packet for unknown connection handle 3837 [278663.972533] Bluetooth: hci0: ACL packet for unknown connection handle 3837 [278666.922671] Bluetooth: hci0: ACL packet for unknown connection handle 3837 [278669.291930] Bluetooth: hci0: ACL packet for unknown connection handle 3837 [278673.299147] Bluetooth: hci0: ACL packet for unknown connection handle 3837 [278675.681829] Bluetooth: hci0: ACL packet for unknown connection handle 3837 [278693.982873] Bluetooth: hci0: ACL packet for unknown connection handle 3837 [278695.476906] Bluetooth: hci0: ACL packet for unknown connection handle 3837 [278703.181558] Bluetooth: hci0: ACL packet for unknown connection handle 3837
Signature · 4 lines
You may reply to this email to add a comment. You are receiving this mail because: You are the assignee for the bug.
[Bug 80791] "Bluetooth: hci0: ACL packet for unknown connection handle" must be hidden behind "debug"
In reply to a message not in the archivehttps://bugzilla.kernel.org/show_bug.cgi?id=80791
--- Comment #8 from Artem S. Tashkinov ([email protected]) ---
Is this mailing list still relevant/active/actual or I should CC different people?
This bug report has received zero attention from kernel Bluetooth developers and it seems to be trivial to fix.
Signature · 4 lines
You may reply to this email to add a comment. You are receiving this mail because: You are the assignee for the bug.
[Bug 80791] "Bluetooth: hci0: ACL packet for unknown connection handle" must be hidden behind "debug"
In reply to a message not in the archivehttps://bugzilla.kernel.org/show_bug.cgi?id=80791
--- Comment #9 from Artem S. Tashkinov ([email protected]) --- The issue has now been known for close to a decade.
Signature · 4 lines
You may reply to this email to add a comment. You are receiving this mail because: You are the assignee for the bug.
[Bug 80791] "Bluetooth: hci0: ACL packet for unknown connection handle" must be hidden behind "debug"
In reply to a message not in the archivehttps://bugzilla.kernel.org/show_bug.cgi?id=80791
--- Comment #10 from Artem S. Tashkinov ([email protected]) --- Sorry for a flood of messages but I really want this issues to be attended.
Otherwise multiple people have a flood of useless messages in their kernel log.
Signature · 4 lines
You may reply to this email to add a comment. You are receiving this mail because: You are the assignee for the bug.
[Bug 80791] "Bluetooth: hci0: ACL packet for unknown connection handle" must be hidden behind "debug"
In reply to a message not in the archivehttps://bugzilla.kernel.org/show_bug.cgi?id=80791
Jakub Jankiewicz ([email protected]) changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |[email protected]
--- Comment #11 from Jakub Jankiewicz ([email protected]) --- I have a similar issue. My hardware:
laptop Lenovo Legion Pro 5 16IAX10 Ultra 7 255HX (from 2025)
System Fedora 42 Xfce.
uname -a
Linux jcubic 6.16.4-200.fc42.x86_64 #1 SMP PREEMPT_DYNAMIC Thu Aug 28 19:47:10 UTC 2025 x86_64 GNU/Linux
My Bluetooth Adapter:
Bus 003 Device 007: ID 0489:e111 Foxconn / Hon Hai Wireless_Device
dmesg output
[ 49.567615] Bluetooth: hci0: ACL packet for unknown connection handle 3837 [ 599.542960] Bluetooth: hci0: ACL packet for unknown connection handle 3837 [ 1437.569560] Bluetooth: hci0: ACL packet for unknown connection handle 3837 [ 3859.566676] Bluetooth: hci0: ACL packet for unknown connection handle 3837 [ 4453.577203] Bluetooth: hci0: ACL packet for unknown connection handle 3837 [ 4567.071519] Bluetooth: hci0: ACL packet for unknown connection handle 3837 [ 4924.313398] usb 3-10: USB disconnect, device number 5 [ 5240.053501] Bluetooth: hci0: ACL packet for unknown connection handle 3837 [ 5628.063962] Bluetooth: hci0: ACL packet for unknown connection handle 3837 [ 5949.560492] Bluetooth: hci0: ACL packet for unknown connection handle 3837 [ 6101.594003] perf: interrupt took too long (2534 > 2500), lowering kernel.perf_event_max_sample_rate to 78000 [ 7169.561230] Bluetooth: hci0: ACL packet for unknown connection handle 3837 [ 7223.579889] Bluetooth: hci0: ACL packet for unknown connection handle 3837 [ 9081.183509] perf: interrupt took too long (3191 > 3167), lowering kernel.perf_event_max_sample_rate to 62000 [ 9387.061556] Bluetooth: hci0: ACL packet for unknown connection handle 3837 [ 9403.597909] i915 0000:00:02.0: [drm] *ERROR* Atomic update failure on pipe A (start=1409651 end=1409652) time 125 us, min 1574, max 1600, scanline start 1572, end 1573 [ 9674.574688] Bluetooth: hci0: ACL packet for unknown connection handle 3837 [10152.077253] Bluetooth: hci0: ACL packet for unknown connection handle 3837 [11119.576619] Bluetooth: hci0: ACL packet for unknown connection handle 3837 [12687.069915] Bluetooth: hci0: ACL packet for unknown connection handle 3837 [14921.072319] perf: interrupt took too long (3990 > 3988), lowering kernel.perf_event_max_sample_rate to 50000 [20399.081113] Bluetooth: hci0: ACL packet for unknown connection handle 3837
All Bluetooth entries marked in red
Signature · 4 lines
You may reply to this email to add a comment. You are receiving this mail because: You are the assignee for the bug.
[Bug 80791] "Bluetooth: hci0: ACL packet for unknown connection handle" must be hidden behind "debug"
In reply to a message not in the archivehttps://bugzilla.kernel.org/show_bug.cgi?id=80791
--- Comment #12 from Jakub Jankiewicz ([email protected]) ---
I think this is a real bug, I've just noticed with latest Kernel 6.16.5 (Fedora testing 6.16.5-200.fc42.x86_64), the music I play via Bluetooth speakers is interrupted when this happens. And it happens a lot. So this is a bug in the driver that needs to be fixed, not hidden.
Signature · 4 lines
You may reply to this email to add a comment. You are receiving this mail because: You are the assignee for the bug.
[Bug 80791] "Bluetooth: hci0: ACL packet for unknown connection handle" must be hidden behind "debug"
In reply to a message not in the archivehttps://bugzilla.kernel.org/show_bug.cgi?id=80791
--- Comment #13 from Artem S. Tashkinov ([email protected]) --- (In reply to Jakub Jankiewicz from comment #12)
Quoted 4 lines
I think this is a real bug, I've just noticed with latest Kernel 6.16.5 (Fedora testing 6.16.5-200.fc42.x86_64), the music I play via Bluetooth speakers is interrupted when this happens. And it happens a lot. So this is a bug in the driver that needs to be fixed, not hidden.
Open a new bug report and specify your HW.
Also make sure Windows is not affected.
If it's a regression, please bisect:
https://docs.kernel.org/admin-guide/bug-bisect.html
Signature · 4 lines
You may reply to this email to add a comment. You are receiving this mail because: You are the assignee for the bug.
[Bug 80791] "Bluetooth: hci0: ACL packet for unknown connection handle" must be hidden behind "debug"
In reply to a message not in the archivehttps://bugzilla.kernel.org/show_bug.cgi?id=80791
--- Comment #14 from Jakub Jankiewicz ([email protected]) --- Already reported:
https://bugzilla.kernel.org/show_bug.cgi?id=220564
But I'm not sure about Windows, the laptop was without OS. And I installed Fedora on it.
Signature · 4 lines
You may reply to this email to add a comment. You are receiving this mail because: You are the assignee for the bug.
[Bug 80791] "Bluetooth: hci0: ACL packet for unknown connection handle" must be hidden behind "debug"
In reply to a message not in the archivehttps://bugzilla.kernel.org/show_bug.cgi?id=80791
webcaptcha ([email protected]) changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |[email protected]
--- Comment #15 from webcaptcha ([email protected]) --- Do we have any updates on this?
I have notificattions on journal errors and this spam me so bad. Every 30 seconds or so I get a notification.
Signature · 4 lines
You may reply to this email to add a comment. You are receiving this mail because: You are the assignee for the bug.
[Bug 80791] "Bluetooth: hci0: ACL packet for unknown connection handle" must be hidden behind "debug"
In reply to a message not in the archivehttps://bugzilla.kernel.org/show_bug.cgi?id=80791
Victor Engmark ([email protected]) changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |[email protected]
--- Comment #16 from Victor Engmark ([email protected]) --- Found this issue while looking for a reason why my Bose QC-45s were crackling during playback.
Quoted 1 line
kernel: Bluetooth: hci0: ACL packet for unknown connection handle 3837
(Oddly, it's even the same handle number as the two logs other people have posted above. Is there something special about that?)
sudo systemctl restart bluetooth seems to have fixed it.
Running NixOS unstable (26.11, commit ID 2fcb964de67fcf60b43471c55d5d99e61a9ccb5a) with bluez 5.86
Service config:
``` ❯ cat /nix/store/zc356bzkix2dj7l63jpsphi89px6wc2x-system-units/bluetooth.service.d/overrides.conf [Unit] [Service] Environment="LOCALE_ARCHIVE=/nix/store/dmm8l3wf59027myllvph9b0w5bzdllp8-glibc-locales-2.42-67/lib/locale/locale-archive" Environment="PATH=/nix/store/di26b1kkbammy0sj70nq5qzvfrh78wxl-coreutils-9.11/bin:/nix/store/fcqbwp5hx5wh3lzf0457wmf0divknz7y-findutils-4.11.0/bin:/nix/store/aak8d9mrdv9sgn0lcg7xss7wxdg9sqh3-gnugrep-3.12/bin:/nix/store/7mfsmbhsd3arnypipwm251rcd0b45riy-gnused-4.10/bin:/nix/store/r6sz8p6sd6c73fp9z8nzl04dri7lyx8n-systemd-261.1/bin:/nix/store/di26b1kkbammy0sj70nq5qzvfrh78wxl-coreutils-9.11/sbin:/nix/store/fcqbwp5hx5wh3lzf0457wmf0divknz7y-findutils-4.11.0/sbin:/nix/store/aak8d9mrdv9sgn0lcg7xss7wxdg9sqh3-gnugrep-3.12/sbin:/nix/store/7mfsmbhsd3arnypipwm251rcd0b45riy-gnused-4.10/sbin:/nix/store/r6sz8p6sd6c73fp9z8nzl04dri7lyx8n-systemd-261.1/sbin" Environment="TZDIR=/nix/store/2nndxyf3phkb5aggxm3c16sapa0f49kz-tzdata-2026c/share/zoneinfo" X-RestartIfChanged=false CapabilityBoundingSet=CAP_NET_BIND_SERVICE ConfigurationDirectoryMode=0755 ExecStart= ExecStart=/nix/store/5w050dyskx5si0skc328b0q9mxbn5lmn-bluez-5.86/libexec/bluetooth/bluetoothd "-f" "/etc/bluetooth/main.conf" LockPersonality=true MemoryDenyWriteExecute=true NoNewPrivileges=true PrivateNetwork=false PrivateTmp=true PrivateUsers=false ProtectControlGroups=true ProtectKernelModules=false ProtectKernelTunables=false ProtectProc=invisible RestrictNamespaces=true RestrictRealtime=true RestrictSUIDSGID=true SystemCallArchitectures=native SystemCallFilter=@system-service [Install] WantedBy=bluetooth.target ```
bluez config:
``` ❯ cat /etc/bluetooth/main.conf [General] ControllerMode=dual Privacy=device [LE] ConnectionLatency=0 MaxConnectionInterval=9 MinConnectionInterval=7 [Policy] AutoEnable=true ```
Signature · 4 lines
You may reply to this email to add a comment. You are receiving this mail because: You are the assignee for the bug.