I only tested bionic, the stereo playback works seemingly flawless. The
low volume problem is indeed still present, but as Dave pointed out,
changing the headphone gain from -16 (50%) to 0 (100%) solves it (Thanks
Dave!).

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https://bugs.launchpad.net/bugs/1758736

Title:
  [USB-Audio - SteelSeries Arctis 7, playback] No stereo playback only
  mono playback

Status in pulseaudio package in Ubuntu:
  Fix Released
Status in pulseaudio source package in Bionic:
  Fix Committed
Status in pulseaudio source package in Cosmic:
  Fix Committed
Status in pulseaudio source package in Disco:
  Fix Released

Bug description:
  [Impact]

   * User is only able to get mono audio from steelseries headsets
  because they provide both a stereo and mono output.  PA selects the
  mono output by default.

   * This should be backported to stable releases because this fix is 
     isolated to code that only applies to the affected headsets.  
     Additionally other gaming headsets may be more easily enabled by adding 
  ATTRS{idVendor}=="<VENDOR>", ATTRS{idProduct}=="<PRODUCT>", 
ENV{PULSE_PROFILE_SET}="steelseries-arctis-7-usb-audio.conf"
     to /lib/udev/rules.d/90-pulseaudio.rules now.  Such as the Lucidsound 
     LS31 which I own.

   * The upload fixes the bug by conditionally setting a pulseaudio
  profile for the headset based on specific usb vendor and product ids
  in the udev rules.

  [Test Case]

   1. Acquire headset.
   2. Open sound settings, and click test speakers.
   3. Only option available will be mono sound

  [Regression Potential]

   * Risk of regressions should be mitigated to those who own the
  headset.  In which case it is likely that their headset is already not
  working.

  [Other Info]
   
   * All patches originate from upstream pulseaudio, and are documented as
     such including the shas.
   
   * I will be pursuing enabling other similar headsets in the coming weeks.
   * I plan to work with upstream pulseaudio to enable my own headset and to
     also make the headset templates backported here more generic.

  
  ---------------- Original Description -------------------------

  There is not stereo playback only mono playback

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: pulseaudio 1:10.0-2ubuntu3.1
  ProcVersionSignature: Ubuntu 4.13.0-37.42-generic 4.13.13
  Uname: Linux 4.13.0-37-generic x86_64
  ApportVersion: 2.20.7-0ubuntu3.7
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/pcmC1D0p:   kaj        1755 F...m pulseaudio
   /dev/snd/controlC1:  kaj        1755 F.... pulseaudio
   /dev/snd/pcmC0D0c:   kaj        1755 F...m pulseaudio
   /dev/snd/controlC0:  kaj        1755 F.... pulseaudio
  CurrentDesktop: ubuntu:GNOME
  Date: Sun Mar 25 21:30:50 2018
  InstallationDate: Installed on 2018-03-08 (17 days ago)
  InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20180105.1)
  SourcePackage: pulseaudio
  Symptom: audio
  Symptom_AlsaPlaybackTest: ALSA playback test through plughw:S7 successful
  Symptom_Card: SteelSeries Arctis 7 - SteelSeries Arctis 7
  Symptom_PulsePlaybackTest: PulseAudio playback test failed
  Symptom_Type: No sound at all
  Title: [USB-Audio - SteelSeries Arctis 7, playback] No sound at all
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/09/2016
  dmi.bios.vendor: LENOVO
  dmi.bios.version: R06ET35W (1.09 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20FMS2AV00
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40697 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: 
dmi:bvnLENOVO:bvrR06ET35W(1.09):bd03/09/2016:svnLENOVO:pn20FMS2AV00:pvrThinkPadT460:rvnLENOVO:rn20FMS2AV00:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone:
  dmi.product.family: ThinkPad T460
  dmi.product.name: 20FMS2AV00
  dmi.product.version: ThinkPad T460
  dmi.sys.vendor: LENOVO

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