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[Raymond <1357724@xxxxxxxxxxxxxxxxxx>]

low volume is expected when you plug headphone into line out Jack
because HP AMP is not enabled in line out node 0x14

you need hint add_jack_modes=1 to create line out Jack mode control
which allow you to change the line out Jack to support headphone


https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/tree/Documentation/sound/alsa/HD-Audio.txt


- add_jack_modes (bool): add "xxx Jack Mode" enum controls to each
  I/O jack for allowing to change the headphone amp and mic bias VREF
  capabilities
:

ode 0x14 [Pin Complex] wcaps 0x40058d: Stereo Amp-Out
  Control: name="Front Playback Switch", index=0, device=0
    ControlAmp: chs=3, dir=Out, idx=0, ofs=0
  Control: name="Line Out Front Jack", index=0, device=0
  Amp-Out caps: ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1
  Amp-Out vals:  [0x00 0x00]
  Pincap 0x0001003e: IN OUT HP EAPD Detect Trigger
  EAPD 0x2: EAPD
  Pin Default 0x01015010: [Jack] Line Out at Ext Rear
    Conn = 1/8, Color = Red
    DefAssociation = 0x1, Sequence = 0x0
  Pin-ctls: 0x40: OUT
  Unsolicited: tag=05, enabled=1
  Power states:  D0 D1 D2 D3 EPSS
  Power: setting=D0, actual=D0
  Connection: 1
     0x0c

Node 0x1b [Pin Complex] wcaps 0x40058f: Stereo Amp-In Amp-Out
  Control: name="Headphone Playback Switch", index=0, device=0
    ControlAmp: chs=3, dir=Out, idx=0, ofs=0
  Control: name="Front Headphone Jack", index=0, device=0
  Amp-In caps: ofs=0x00, nsteps=0x03, stepsize=0x27, mute=0
  Amp-In vals:  [0x00 0x00]
  Amp-Out caps: ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1
  Amp-Out vals:  [0x00 0x00]
  Pincap 0x0001373e: IN OUT HP EAPD Detect Trigger
    Vref caps: HIZ 50 GRD 80 100
  EAPD 0x2: EAPD
  Pin Default 0x02214020: [Jack] HP Out at Ext Front
    Conn = 1/8, Color = Green
    DefAssociation = 0x2, Sequence = 0x0
  Pin-ctls: 0xc0: OUT HP VREF_HIZ
  Unsolicited: tag=01, enabled=1
  Power states:  D0 D1 D2 D3 EPSS
  Power: setting=D0, actual=D0
  Connection: 5
     0x0c 0x0d 0x0e 0x0f 0x26*

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https://bugs.launchpad.net/bugs/1357724

Title:
  Extremely low volume from HP, also skipping and distorted voice

Status in “alsa-driver” package in Ubuntu:
  New

Bug description:
  I plugged into my headphone into rear red jack and I got extremely low
  volume despite I set max volume with slider, so is front Headphone
  jack. I dumpped the sound codec and found they are all EAPD node. I
  also get some skipping and distorted issue.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu4
  ProcVersionSignature: Ubuntu 3.13.0-34.60-generic 3.13.11.4
  Uname: Linux 3.13.0-34-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.3
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Sat Aug 16 21:57:33 2014
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2014-08-15 (1 days ago)
  InstallationMedia: Xubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140723)
  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: Red Line Out, Rear
  Symptom_PulsePlaybackTest: PulseAudio playback test successful
  Symptom_Type: Underruns, dropouts, or "crackling" sound
  Title: [MS-7918, Realtek ALC1150, Red Line Out, Rear] Underruns, dropouts or crackling sound
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/24/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: V2.3
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: Z97 GAMING 3 (MS-7918)
  dmi.board.vendor: MSI
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: To be filled by O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: MSI
  dmi.chassis.version: 1.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrV2.3:bd07/24/2014:svnMSI:pnMS-7918:pvr1.0:rvnMSI:rnZ97GAMING3(MS-7918):rvr1.0:cvnMSI:ct3:cvr1.0:
  dmi.product.name: MS-7918
  dmi.product.version: 1.0
  dmi.sys.vendor: MSI

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