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Enistone

Member

Registered: 2025-09-14

Posts: 1

Bluetooth: Suddenly corrupted SCO packet

This is my first post,

I am absolutely lost at why this occured so suddenly and randomly: while listening to music as usual, my Bluetooth headphones started playing a medium-frequency sound, continuously, blocking out every sound. I tried disconnecting it by pressing the Disconnect button software-ly (I use bluez for Bluetooth), it did not stop even after successfully disconnecting it.

I had to hold the power button on the Bluetooth headphones for longer than usual for it to turn off (I'm assuming this is how to force-shutoff): it fixed itself, however, I am not certain this is a long-term solution. Here is what I found after executing "dmesg | tail" ...

DURING the sound:

[   40.082538] usb 4-1.3: 1:0: usb_set_interface failed (-32)
[   40.402738] usb 3-1.1: 3:1: cannot get freq at ep 0x84
[   40.411132] usb 3-1.1: 3:1: cannot get freq at ep 0x84
[   40.541764] Bluetooth: RFCOMM TTY layer initialized
[   40.541772] Bluetooth: RFCOMM socket layer initialized
[   40.541776] Bluetooth: RFCOMM ver 1.11
[   49.330304] usb 4-1.3: 2:1: cannot get freq at ep 0x1
[ 1065.425270] hrtimer: interrupt took 8148 ns
[ 1785.140019] input: JBL T450BT (AVRCP) as /devices/virtual/input/input28
[ 1916.163575] input: JBL T450BT (AVRCP) as /devices/virtual/input/input29

AFTER the sound (and reconnecting the device as if nothing happened):

[   40.541776] Bluetooth: RFCOMM ver 1.11
[   49.330304] usb 4-1.3: 2:1: cannot get freq at ep 0x1
[ 1065.425270] hrtimer: interrupt took 8148 ns
[ 1785.140019] input: JBL T450BT (AVRCP) as /devices/virtual/input/input28
[ 1916.163575] input: JBL T450BT (AVRCP) as /devices/virtual/input/input29
[ 2479.839989] Bluetooth: hci0: corrupted SCO packet
[ 2479.839995] Bluetooth: hci0: corrupted SCO packet
[ 2479.839996] Bluetooth: hci0: corrupted SCO packet
[ 2479.843317] Bluetooth: hci0: SCO packet for unknown connection handle 45
[ 2481.125573] input: JBL T450BT (AVRCP) as /devices/virtual/input/input30

I searched a while for the "corrupted SCO packet" issue, but have found no explanation to it so far. Or am I missing the point?
How to look into this? Any direction would be appreciated.

Last edited by Enistone (2025-09-14 21:10:29)

gromit

Administrator

From: Germany

Registered: 2024-02-10

Posts: 1,497

Website

Re: Bluetooth: Suddenly corrupted SCO packet

Really late reply, but are you still facing this issue?

Epsilon1

Member

From: CA, USA

Registered: 2025-10-27

Posts: 3

Re: Bluetooth: Suddenly corrupted SCO packet

Hi y'all: I actually started facing the same issue

"Bluetooth: hci0: corrupted SCO packet"

I Updated some org.kde.* packages about two days ago and started noticing the issue, though I'd have to fly through my logs to find out.

An unrelated issue I had was a need for me to passwd my root account to use kSysLog.

I'll do some speculation here soon and scour some posts really quick to do some troubleshooting!*

*EDIT: lemme just... clonezilla a backup really quick....

Last edited by Epsilon1 (2025-10-27 04:32:38)

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Collector, fixer, player-with-er and troubleshooter of retro and vintage tech! Current collection includes and is in no way limited to: Mac Plus, Performa 630CD, IBM 5150 souped up on EGA, memory, and external ports, A 486 Machine w/ the works, hundreds of floppy diskettes, about a thousand DVDs I need to eventually burn... More on!

Epsilon1

Member

From: CA, USA

Registered: 2025-10-27

Posts: 3

Re: Bluetooth: Suddenly corrupted SCO packet

tld;dr of the sudo issue:

 "kf.i18n: KLocalizedString: Domain is not set for this string, translation will not work. Please see https://api.kde.org/frameworks/ki18n/html/prg_guide.html msgid: "KDE su daemon" msgid_plural: "" msgctxt: ""

This was fixed after a complete upgrade which included flatpack versions of things (wtf?)

*anyway* After the backup...
I really only noted this SCO error and that buzz you described when my device lost signal from either walking away from my device, or if the battery was about to die. Those are the only two situations where I got the buzz, though I had the SCO error spam my message daemon *edit: the entire time the headset was connected.
After updating, and after re-setting up Bluetooth via bluez(5), adding the stream as a Hi-Def (which i forget the exact name of the codec at the moment) my SCO disconnects seem over... Though I JUST got back from all this, and I'll definitely report any other issues If I have any.

Last edited by Epsilon1 (2025-10-29 02:49:23)

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Collector, fixer, player-with-er and troubleshooter of retro and vintage tech! Current collection includes and is in no way limited to: Mac Plus, Performa 630CD, IBM 5150 souped up on EGA, memory, and external ports, A 486 Machine w/ the works, hundreds of floppy diskettes, about a thousand DVDs I need to eventually burn... More on!

Epsilon1

Member

From: CA, USA

Registered: 2025-10-27

Posts: 3

Re: Bluetooth: Suddenly corrupted SCO packet

HI everyone in this post and abroad... My 'SCO corruption' has returned, with a vengeance! Lemme get some logs and I'll update shortly.ww

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Collector, fixer, player-with-er and troubleshooter of retro and vintage tech! Current collection includes and is in no way limited to: Mac Plus, Performa 630CD, IBM 5150 souped up on EGA, memory, and external ports, A 486 Machine w/ the works, hundreds of floppy diskettes, about a thousand DVDs I need to eventually burn... More on!

widesoft

Member

Registered: 2026-01-03

Posts: 3

Re: Bluetooth: Suddenly corrupted SCO packet

I had same issue today. I downgraded the packages alsa-ucm-conf, alsa-lib and lib32-alsa-lib to version 1.2.14-2 and works again!

you can run
sudo downgrade alsa-ucm-conf alsa-lib lib32-alsa-lib

gromit

Administrator

From: Germany

Registered: 2024-02-10

Posts: 1,497

Website

Re: Bluetooth: Suddenly corrupted SCO packet

@widesoft is this already reported upstream somewhere?

widesoft

Member

Registered: 2026-01-03

Posts: 3

Re: Bluetooth: Suddenly corrupted SCO packet

@gromit I really don't know

gromit

Administrator

From: Germany

Registered: 2024-02-10

Posts: 1,497

Website

Re: Bluetooth: Suddenly corrupted SCO packet

Could you check here and report if no one already did so? https://github.com/alsa-project/alsa-ucm-conf/issues

widesoft

Member

Registered: 2026-01-03

Posts: 3

Re: Bluetooth: Suddenly corrupted SCO packet

I have reported the issue