Please keep this bug about fixing the issue for ath9k wifi only.

So this bug is not a duplicate of bug 405294. This bug is open and
should be fixed in the kernel (package "linux").

** This bug is no longer a duplicate of bug 405294
   A2DP Bluetooth audio skips terribly ["Skipping NNN us (= MMM bytes) in audio 
stream"]

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https://bugs.launchpad.net/bugs/1746164

Title:
  Enable Bluetooth-Wifi coexistence by default [bluetooth audio and
  network skip on Wifi activity]

Status in bluez package in Ubuntu:
  Invalid
Status in linux package in Ubuntu:
  Confirmed

Bug description:
  By default BT audio works fine on Ubuntu - if there is no WiFi active:
  Both work on the same frequency range, 2 WiFi channel is about 20
  Bluetooth Channels wide and every time a WiFi package is sent
  bluetooth risks a packet loss.

  Creating a file named /etc/modprobe.d/bluetooth-audio.conf with the
  following content:

  options ath9k btcoex_enable=1 bt_ant_diversity=1

  resolves the problem and drastically increases bluetooth throughput
  for all other use cases (bluetooth networking that doesn't drop every
  time the WiFi probes something, lower latency Bluetooth HIDs.

  We should ship things in a way that they work out-of-the-box => I am
  all for providing this file with Ubuntu, possibly with Bluez.

  In the case of my laptop btcoex_enable=1 would already do the trick.

  
  Technical background:
   - https://wireless.wiki.kernel.org/en/users/drivers/ath9k/btcoex
   - https://wiki.freebsd.org/dev/ath_hal(4)/AntennaDiversity

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: bluez 5.46-0ubuntu4
  Uname: Linux 4.15.0-041500rc9-lowlatency x86_64
  ApportVersion: 2.20.8-0ubuntu6
  Architecture: amd64
  CurrentDesktop: GNOME
  Date: Tue Jan 30 06:40:12 2018
  EcryptfsInUse: Yes
  InterestingModules: rfcomm bnep btusb bluetooth
  MachineType: Acer Aspire S7-391
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-4.15.0-041500rc9-lowlatency 
root=UUID=6d0fd0ad-9048-4fdb-881a-eba6d6d13c3b ro rootflags=subvol=@ 
acpi_backlight=vendor init=/lib/systemd/systemd intel_pstate=enable 
nmi_watchdog=0 quiet splash acpi_backlight=vendor init=/lib/systemd/systemd 
intel_pstate=enable video=vesafb:ywrap,mtrr=3 nmi_watchdog=0 vt.handoff=1
  SourcePackage: bluez
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 11/16/2012
  dmi.bios.vendor: Insyde Corp.
  dmi.bios.version: V2.09
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: Storm
  dmi.board.vendor: Acer
  dmi.board.version: V2.09
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: Acer
  dmi.chassis.version: V2.09
  dmi.modalias: 
dmi:bvnInsydeCorp.:bvrV2.09:bd11/16/2012:svnAcer:pnAspireS7-391:pvrV2.09:rvnAcer:rnStorm:rvrV2.09:cvnAcer:ct10:cvrV2.09:
  dmi.product.family: ChiefRiver System
  dmi.product.name: Aspire S7-391
  dmi.product.version: V2.09
  dmi.sys.vendor: Acer
  hciconfig:
   hci0:        Type: Primary  Bus: USB
        BD Address: 68:94:23:49:1B:BC  ACL MTU: 1022:8  SCO MTU: 183:5
        UP RUNNING PSCAN 
        RX bytes:688 acl:0 sco:0 events:49 errors:0
        TX bytes:3167 acl:0 sco:0 commands:49 errors:0

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