[Bug 80791] Lot of "hci0 sco packet for unknown connection handle"

[Bug 80791] Lot of "hci0 sco packet for unknown connection handle"

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https://bugzilla.kernel.org/show_bug.cgi?id=80791

Nadia Yvette Chambers <nadia.yvette.chambers@gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |nadia.yvette.chambers@gmail
                   |                            |.com

--- Comment #1 from Nadia Yvette Chambers <nadia.yvette.chambers@gmail.com> ---
I can reproduce this on a Lenovo x100e on 3.16.0-rc6 plus some git.

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[Bug 80791] Lot of "hci0 sco packet for unknown connection handle"

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https://bugzilla.kernel.org/show_bug.cgi?id=80791

Artem S. Tashkinov (aros@gmx.com) changed:

           What    |Removed                     |Added
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                 CC|                            |caravena@gmail.com

--- Comment #2 from Artem S. Tashkinov (aros@gmx.com) ---
*** Bug 85161 has been marked as a duplicate of this bug. ***

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[Bug 80791] Lot of "hci0 sco packet for unknown connection handle"

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--- Comment #3 from Artem S. Tashkinov (aros@gmx.com) ---
*** Bug 90151 has been marked as a duplicate of this bug. ***

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[Bug 80791] Lot of "hci0 sco packet for unknown connection handle"

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--- Comment #4 from Artem S. Tashkinov (aros@gmx.com) ---
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.

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[Bug 80791] Lot of "hci0 sco packet for unknown connection handle"

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Artem S. Tashkinov (aros@gmx.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Kernel Version|3.0.35                      |GIT

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[Bug 80791] Lot of "hci0 sco packet for unknown connection handle"

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https://bugzilla.kernel.org/show_bug.cgi?id=80791

--- Comment #5 from Artem S. Tashkinov (aros@gmx.com) ---
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.

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[Bug 80791] "Bluetooth: hci0: ACL packet for unknown connection handle" must be hidden behind "debug"

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https://bugzilla.kernel.org/show_bug.cgi?id=80791

Artem S. Tashkinov (aros@gmx.com) 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"

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[Bug 80791] "Bluetooth: hci0: ACL packet for unknown connection handle" must be hidden behind "debug"

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Artem S. Tashkinov (aros@gmx.com) changed:

           What    |Removed                     |Added
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                 CC|                            |luiz.dentz@gmail.com

--- Comment #6 from Artem S. Tashkinov (aros@gmx.com) ---
Luiz,

Could you look into this please?

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[Bug 80791] "Bluetooth: hci0: ACL packet for unknown connection handle" must be hidden behind "debug"

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https://bugzilla.kernel.org/show_bug.cgi?id=80791

Artem S. Tashkinov (aros@gmx.com) changed:

           What    |Removed                     |Added
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                 CC|                            |aros@gmx.com

--- Comment #7 from Artem S. Tashkinov (aros@gmx.com) ---
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

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[Bug 80791] "Bluetooth: hci0: ACL packet for unknown connection handle" must be hidden behind "debug"

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--- Comment #8 from Artem S. Tashkinov (aros@gmx.com) ---
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.

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[Bug 80791] "Bluetooth: hci0: ACL packet for unknown connection handle" must be hidden behind "debug"

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--- Comment #9 from Artem S. Tashkinov (aros@gmx.com) ---
The issue has now been known for close to a decade.

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[Bug 80791] "Bluetooth: hci0: ACL packet for unknown connection handle" must be hidden behind "debug"

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--- Comment #10 from Artem S. Tashkinov (aros@gmx.com) ---
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.

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[Bug 80791] "Bluetooth: hci0: ACL packet for unknown connection handle" must be hidden behind "debug"

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https://bugzilla.kernel.org/show_bug.cgi?id=80791

Jakub Jankiewicz (jcubic@onet.pl) changed:

           What    |Removed                     |Added
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                 CC|                            |jcubic@onet.pl

--- Comment #11 from Jakub Jankiewicz (jcubic@onet.pl) ---
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

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[Bug 80791] "Bluetooth: hci0: ACL packet for unknown connection handle" must be hidden behind "debug"

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--- Comment #12 from Jakub Jankiewicz (jcubic@onet.pl) ---
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.

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[Bug 80791] "Bluetooth: hci0: ACL packet for unknown connection handle" must be hidden behind "debug"

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--- Comment #13 from Artem S. Tashkinov (aros@gmx.com) ---
(In reply to Jakub Jankiewicz from comment #12)
> 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

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[Bug 80791] "Bluetooth: hci0: ACL packet for unknown connection handle" must be hidden behind "debug"

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--- Comment #14 from Jakub Jankiewicz (jcubic@onet.pl) ---
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.

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