** Tags added: a2dp a2dp-skip

** Tags removed: cosmic
** Tags added: bionic

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You received this bug notification because you are a member of Desktop
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https://bugs.launchpad.net/bugs/1810636

Title:
  [Qualcomm Atheros QCA6174] Bluetooth audio choppiness

Status in linux package in Ubuntu:
  Confirmed
Status in pulseaudio package in Ubuntu:
  Confirmed

Bug description:
  I'm running Linux 4.20.0-042000-generic #201812232030 x64 on a Dell XPS 9570 
with QCA6174 chipset, and have had the problem with Bluetooth audio choppiness 
ever since I have owned this laptop. This problem has persisted for me with 
previous kernels. If I disable wifi and use media on machine
  locally, the problem doesn't occur.

  Note: I've reverted back v4.18.0-13-generic and reproduced the problem for
  the apport-collect report.

  It started with Ubuntu 18.04 and continues with 18.10. It's
  particularly noticeable when the when saturating the WLAN connection
  with throughput, i.e. copying a large file sequentially across from a
  samba share, but also streaming video online results in the audio
  progressively delaying over-time. Re-establishing the Bluetooth audio
  sync restores the sync, but slowly creeps out again.

  I've upgraded my linux-firmware package to disco 176 to match v4.20
  kernel drivers ref: https://launchpad.net/ubuntu/+source/linux-
  firmware/1.176

  The ath10k_core driver that supports this device has a reference for
  btcoex: ref
  
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/net/wireless/ath/ath10k/core.c?h=v4.20#n2598

  It's possible that the Bluetooth component firmware is not supporting
  or communicating btcoex compatibility, but this is starting to reach
  the edge of my ability to diagnose the problem.

  This btcoex support in ath9k has resolved/improved the Bluetooth
  bandwidth problem for older Qualcomm chipsets as shown in
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1746164

  As a troubleshooting step, I've also tried the very latest firmware-6 file 
from, but I'm continuing to experience the problem ref: 
https://github.com/kvalo/ath10k-firmware/tree/master/QCA6174/hw3.0/4.4.1
  ---
  ProblemType: Bug
  ApportVersion: 2.20.10-0ubuntu13.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  berg       2871 F.... pulseaudio
  CurrentDesktop: GNOME
  DistroRelease: Ubuntu 18.10
  InstallationDate: Installed on 2018-07-02 (187 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  MachineType: Dell Inc. XPS 15 9570
  Package: linux (not installed)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_AU.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.18.0-13-generic 
root=UUID=c825a7b0-a5ac-41de-bd57-7663fef8a1f1 ro quiet splash vt.handoff=1
  ProcVersionSignature: Ubuntu 4.18.0-13.14-generic 4.18.17
  RelatedPackageVersions:
   linux-restricted-modules-4.18.0-13-generic N/A
   linux-backports-modules-4.18.0-13-generic  N/A
   linux-firmware                             1.176
  Tags:  cosmic
  Uname: Linux 4.18.0-13-generic x86_64
  UpgradeStatus: Upgraded to cosmic on 2018-10-18 (79 days ago)
  UserGroups: adm cdrom dip libvirt lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 11/02/2018
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.6.0
  dmi.board.name: 07GHH0
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 10
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvr1.6.0:bd11/02/2018:svnDellInc.:pnXPS159570:pvr:rvnDellInc.:rn07GHH0:rvrA00:cvnDellInc.:ct10:cvr:
  dmi.product.family: XPS
  dmi.product.name: XPS 15 9570
  dmi.product.sku: 087C
  dmi.sys.vendor: Dell Inc.

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