[Bug 1735941] [NEW] no stereo on reconnect or by default for Sony 1000xm2 headphones

[Jonathan Brier]

Public bug reported:

Expectation: Bluetooth headphones attach with stereo sound on every connect.
Issue: only stereo after manual switch of settings on first pair. Reconnect only has mono connection.

Ubuntu 17.10 on a System76 Serval WS.

Mono audio with the Sony 1000XM2 bluetooth headphones is the default on
first pairing and is the only option after turning off the bluetooth or
headphones.

On a new pairing the default is HSP with mono audio. Manually I have to
change to A2DP in the sound settings and I am able to have stereo sound.
Disabling bluetooth or turning off the headphones followed by a
connection will result in mono audio in HSP and switching to A2DP will
also be mono.

Temporary Workaround: remove the headphones from the paired devices and
pair again as a new device to get access to stereo sound again. This
procedure has to be repeated on every reconnect.

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: bluez 5.46-0ubuntu3
ProcVersionSignature: Ubuntu 4.13.0-17.20-generic 4.13.8
Uname: Linux 4.13.0-17-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.7-0ubuntu3.5
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Sat Dec  2 14:54:12 2017
EcryptfsInUse: Yes
InterestingModules: rfcomm bnep btusb bluetooth
MachineType: System76, Inc. Serval WS
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-17-generic.efi.signed root=UUID=90a6c4ca-5b2a-461e-8792-18cd7e54a2fb ro quiet splash vt.handoff=7
SourcePackage: bluez
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 03/08/2016
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1.05.10RSA
dmi.board.asset.tag: Tag 12345
dmi.board.name: Serval WS
dmi.board.vendor: System76, Inc.
dmi.board.version: serw9
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: System76, Inc.
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1.05.10RSA:bd03/08/2016:svnSystem76,Inc.:pnServalWS:pvrserw9:rvnSystem76,Inc.:rnServalWS:rvrserw9:cvnSystem76,Inc.:ct10:cvrN/A:
dmi.product.family: Not Applicable
dmi.product.name: Serval WS
dmi.product.version: serw9
dmi.sys.vendor: System76, Inc.
hciconfig:
 hci0:	Type: Primary  Bus: USB
 	BD Address: 44:85:00:36:47:F9  ACL MTU: 1021:4  SCO MTU: 96:6
 	UP RUNNING PSCAN INQUIRY 
 	RX bytes:18865088 acl:249 sco:362504 events:45487 errors:0
 	TX bytes:53430737 acl:40447 sco:362442 commands:2995 errors:9

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


** Tags: amd64 apport-bug artful

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https://bugs.launchpad.net/bugs/1735941

Title:
  no stereo on reconnect or by default for Sony 1000xm2 headphones

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