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[John Cottier <j.cottier@xxxxxxxxxxxx>]

Same here on a Dell T1700 that has the same chip Realtek ALC280, sound card HDA Intel PCH on 14.04 64 bit.
Tinny and distorted on main rear output jack, perfect on the front headphone jack.

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https://bugs.launchpad.net/bugs/1425221

Title:
  [OptiPlex 9020, Realtek ALC280, Green Line Out, Rear] tinny sound

Status in alsa-driver package in Ubuntu:
  Confirmed

Bug description:
  Sound equalization is normal when using jack in front of computer, but
  is "tinny" (i.e., low/nonexistent bass and midtones) when using rear
  output jack  with simple two channel headphones.

  Jack sense is working correctly because the internal speaker cuts out
  when a cable is plugged into the rear jack (or front jack, for that
  matter).

  Note Dell's website says this computer has a Realtek ALC3220, as
  opposed to the ALC280 which is detected by linux.  This is a clean
  install of 14.04, so I unfortunately I can't boot into Windows to
  observe its behavior.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu4
  ProcVersionSignature: Ubuntu 3.13.0-45.74-generic 3.13.11-ckt13
  Uname: Linux 3.13.0-45-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.7
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Tue Feb 24 12:31:49 2015
  InstallationDate: Installed on 2015-01-30 (25 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  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: Green Line Out, Rear
  Symptom_PulsePlaybackTest: PulseAudio playback test successful
  Symptom_Type: High background noise, or volume is too low
  Title: [OptiPlex 9020, Realtek ALC280, Green Line Out, Rear] Background noise or low volume
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 11/20/2014
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A09
  dmi.board.name: 06X1TJ
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 6
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA09:bd11/20/2014:svnDellInc.:pnOptiPlex9020:pvr01:rvnDellInc.:rn06X1TJ:rvrA00:cvnDellInc.:ct6:cvr:
  dmi.product.name: OptiPlex 9020
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.

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