Here to also report that this issue persists on a newer Samsung laptop.
The model in question is the Notebook 7 Force NP760XBE(Style S51 Pro on
some countries) running 19.10. In my case, the speakers work fine,
though. The problem only manifests itself through headphones: very faint
and distorted sound.

I've reported it everywhere support-wise and posted it as a question here, on 

My alsa-info output file could be found here: http://alsa-

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  Samsung Notebook 9 Pro - Internal Speaker Playback problem - HDA Intel
  - Realtek ALC298

Status in alsa-driver package in Ubuntu:

Bug description:
  Unable to get system speakers working running 19.04.  At max volume,
  sound is barely perceptible through headphones.  Pavucontrol shows
  sounds is present, but no amount of adjustments makes a difference.

  ProblemType: Bug
  DistroRelease: Ubuntu 19.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu5
  ProcVersionSignature: Ubuntu 5.0.0-20.21-generic 5.0.8
  Uname: Linux 5.0.0-20-generic x86_64
  ApportVersion: 2.20.10-0ubuntu27
  Architecture: amd64
   /dev/snd/controlC0:  robert     3355 F.... pulseaudio
  CurrentDesktop: KDE
  Date: Fri Jun 28 00:44:13 2019
  InstallationDate: Installed on 2019-06-05 (22 days ago)
  InstallationMedia: Kubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaPlaybackTest: ALSA playback test through plughw:PCH failed
  Symptom_Card: Built-in Audio - HDA Intel PCH
  Symptom_Jack: Digital Out, HDMI
  Symptom_Type: None of the above
  Title: [930MBE, Intel Kabylake HDMI, Digital Out, HDMI] Playback problem
  UpgradeStatus: No upgrade log present (probably fresh install) 04/25/2019
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: P02AHK.029.190425.PS
  dmi.board.asset.tag: No Asset Tag NP930MBE-K04US
  dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.board.version: SGL9872A0S-C01-G001-S0001+10.0.17763
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 31
  dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.chassis.version: N/A
dmi:bvnAmericanMegatrendsInc.:bvrP02AHK.029.190425.PS:bd04/25/2019:svnSAMSUNGELECTRONICSCO.,LTD.:pn930MBE:pvrP02AHK:rvnSAMSUNGELECTRONICSCO.,LTD.:rnNP930MBE-K04US:rvrSGL9872A0S-C01-G001-S0001+10.0.17763:cvnSAMSUNGELECTRONICSCO.,LTD.:ct31:cvrN/A: Notebook 9 Series 930MBE
  dmi.product.sku: SCAI-A5A5-A5A5-A5A5-PAHK
  dmi.product.version: P02AHK
  dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.

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