Identical symptoms, package version, distro version, also ALC298, also
tried windows, only difference is computer model (Lenovo T570).
Confirmed on two identical computers with identical setups. Sorry, don't
know how to generate a new report or add debug info.

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https://bugs.launchpad.net/bugs/1762314

Title:
  Sound output too low

Status in alsa-driver package in Ubuntu:
  Confirmed

Bug description:
  Sound output on lenovo p51s is too low. No option to go above 100% in volume 
settings. Download pulse audio volume control to raise application and output 
volume to 153%, which helps to some extent, but then leads to distortion. 
  Was running windows 10 on same system and audio was loud enough!
  Also after this morning
  s update, the volume keys no longer work, even after re-mapping them in 
shortcuts.3

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu5
  ProcVersionSignature: Ubuntu 4.15.0-13.14-generic 4.15.10
  Uname: Linux 4.15.0-13-generic x86_64
  ApportVersion: 2.20.9-0ubuntu4
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  jatin      2098 F.... pulseaudio
  CurrentDesktop: Budgie:GNOME
  Date: Sun Apr  8 22:50:04 2018
  InstallationDate: Installed on 2018-03-23 (17 days ago)
  InstallationMedia: Ubuntu-Budgie 18.04 LTS "Bionic Beaver" - Alpha amd64 
(20180307.1)
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaPlaybackTest: ALSA playback test through plughw:PCH successful
  Symptom_Card: Built-in Audio - HDA Intel PCH
  Symptom_Jack: Speaker, Internal
  Symptom_PulsePlaybackTest: PulseAudio playback test successful
  Symptom_Type: High background noise, or volume is too low
  Title: [20HCS06601, Realtek ALC298, Speaker, Internal] Background noise or 
low volume
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/03/2017
  dmi.bios.vendor: LENOVO
  dmi.bios.version: N1VET36W (1.26 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20HCS06601
  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:bvrN1VET36W(1.26):bd10/03/2017:svnLENOVO:pn20HCS06601:pvrThinkPadP51s:rvnLENOVO:rn20HCS06601:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone:
  dmi.product.family: ThinkPad P51s
  dmi.product.name: 20HCS06601
  dmi.product.version: ThinkPad P51s
  dmi.sys.vendor: LENOVO

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