[Bug 1746164] [NEW] Enable Bluetooth-Wifi coexistence by default [bluetooth audio and network skip on Wifi activity]

[PeterPall]

Public bug reported:

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

** Affects: bluez (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic wayland-session

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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]

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