Same for pretty much all my bluetooth headsets (Skullcandy Uproar
Wireless, Plantronics E50 or M70 & others).

On Ubuntu 20.10, kernel Linux 5.7.0-050700-generic

01.07.2020 12:02        pulseaudio      SCO packet received of unaligned size: 5
01.07.2020 12:02        kernel  Bluetooth: hci0: SCO packet for unknown 
connection handle 4093
01.07.2020 12:02        kernel  Bluetooth: hci0: SCO packet for unknown 
connection handle 3
01.07.2020 12:02        kernel  Bluetooth: hci0: SCO packet for unknown 
connection handle 1535
01.07.2020 12:02        kernel  Bluetooth: hci0: SCO packet for unknown 
connection handle 4093
01.07.2020 12:02        kernel  Bluetooth: hci0: SCO packet for unknown 
connection handle 4095
01.07.2020 12:02        kernel  Bluetooth: hci0: SCO packet for unknown 
connection handle 4095

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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1430696

Title:
  Bluetooth audio instability: Bluetooth: hci0 SCO packet for unknown
  connection handle

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  (I'm creating a new bug as instructed at
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/898347/comments/29)

  I havea Nokia BH-216 bluetooth headset. Generally it works well, but
  randomly (after 5-15 minutes of use) it gets disconnected.

  The kernel log output looks like this:

  [ 3272.270382] Bluetooth: hci0 SCO packet for unknown connection handle 0
  [ 3272.270383] Bluetooth: hci0 SCO packet for unknown connection handle 0
  [ 3272.270384] Bluetooth: hci0 SCO packet for unknown connection handle 0
  [ 3272.270384] Bluetooth: hci0 SCO packet for unknown connection handle 48
  [ 3272.270385] Bluetooth: hci0 SCO packet for unknown connection handle 0
  [ 3272.270386] Bluetooth: hci0 SCO packet for unknown connection handle 0

  With quick googling this seems to be happening to other people with
  other hardware and distributions so i suppose this is a BT audio bug
  in kernel. Bug #898347 is related.

  Tested on up to date Ubuntu 14.10 x86_64.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: linux-image-3.16.0-31-generic 3.16.0-31.41
  ProcVersionSignature: Ubuntu 3.16.0-31.41-generic 3.16.7-ckt5
  Uname: Linux 3.16.0-31-generic x86_64
  ApportVersion: 2.14.7-0ubuntu8.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  vranki     2421 F.... pulseaudio
   /dev/snd/controlC1:  vranki     2421 F.... pulseaudio
  CurrentDesktop: X-Cinnamon
  Date: Wed Mar 11 11:22:19 2015
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=71d76087-3fdf-4f57-a0f4-0b128be4d386
  InstallationDate: Installed on 2015-02-12 (26 days ago)
  InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
  MachineType: LENOVO 20C600LLMS
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-31-generic 
root=UUID=e114ca99-f1c7-450f-a4a5-553075d92b7c ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-31-generic N/A
   linux-backports-modules-3.16.0-31-generic  N/A
   linux-firmware                             1.138.1
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/14/2014
  dmi.bios.vendor: LENOVO
  dmi.bios.version: J9ET96WW (2.16 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20C600LLMS
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0E50510 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: 
dmi:bvnLENOVO:bvrJ9ET96WW(2.16):bd10/14/2014:svnLENOVO:pn20C600LLMS:pvrThinkPadEdgeE540:rvnLENOVO:rn20C600LLMS:rvrSDK0E50510WIN:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 20C600LLMS
  dmi.product.version: ThinkPad Edge E540
  dmi.sys.vendor: LENOVO

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