[LG HBS850, playback] volume slider problem

[Alex Welch]

the left ear bud is extremely quiet on ubuntu but is just fine on windows.
I am using Ubuntu 16.04 LTS

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 4.4.0-93.116-generic 4.4.79
Uname: Linux 4.4.0-93-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.10
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/pcmC0D0c: alex 1983 F...m pulseaudio
 /dev/snd/controlC0: alex 1983 F.... pulseaudio
CurrentDesktop: Unity
Date: Fri Sep 29 21:36:39 2017
InstallationDate: Installed on 2016-11-25 (308 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Symptom_Card: LG HBS850
Symptom_Type: Volume slider, or mixer problems
Title: [LG HBS850, playback] volume slider problem
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/26/2012
dmi.bios.vendor: INSYDE
dmi.bios.version: 2.60
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: Base Board Product Name
dmi.board.vendor: Intel Corp.
dmi.board.version: Base Board Version
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: OEM Chassis Manufacturer
dmi.chassis.version: OEM Chassis Version
dmi.modalias: dmi:bvnINSYDE:bvr2.60:bd06/26/2012:svnTOSHIBA:pnSatelliteL745:pvrPSK0YU-0D102G:rvnIntelCorp.:rnBaseBoardProductName:rvrBaseBoardVersion:cvnOEMChassisManufacturer:ct10:cvrOEMChassisVersion:
dmi.product.name: Satellite L745
dmi.product.version: PSK0YU-0D102G
dmi.sys.vendor: TOSHIBA