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[Raymond <1509470@xxxxxxxxxxxxxxxxxx>]

select stereo profile is enough since snd-hda-intel copy front channels
to rear channels

use 4.0 allow you to adjust volume front and rear speakers


your subwoofer are only controlled by the volume knob

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https://bugs.launchpad.net/bugs/1509470

Title:
  Sound very low in subwoofer.

Status in alsa-driver package in Ubuntu:
  Incomplete

Bug description:
  I have upgraded from ubuntu 15.04 to 15.10. After this the sound from
  the subwoofer is very low. I tested with another machine which is a
  15.04 to check if my subwoofer was busted and found that the sound
  comes out fine. I have a 4.1 Creative speakers.

  In the present machine I have a snd-hda-intel.
  lspci -vv output

  00:1b.0 Audio device: Intel Corporation 82801JI (ICH10 Family) HD Audio Controller
          Subsystem: Dell Device 02ac
          Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
          Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
          Latency: 0, Cache Line Size: 32 bytes
          Interrupt: pin A routed to IRQ 29
          Region 0: Memory at fe9f4000 (64-bit, non-prefetchable) [size=16K]
          Capabilities: [50] Power Management version 2
                  Flags: PMEClk- DSI- D1- D2- AuxCurrent=55mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
                  Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
          Capabilities: [60] MSI: Enable+ Count=1/1 Maskable- 64bit+
                  Address: 00000000fee0f00c  Data: 41d2
          Capabilities: [70] Express (v1) Root Complex Integrated Endpoint, MSI 00
                  DevCap: MaxPayload 128 bytes, PhantFunc 0
                          ExtTag- RBE-
                  DevCtl: Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
                          RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop+
                          MaxPayload 128 bytes, MaxReadReq 128 bytes
                  DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr+ TransPend-
          Capabilities: [100 v1] Virtual Channel
                  Caps:   LPEVC=0 RefClk=100ns PATEntryBits=1
                  Arb:    Fixed- WRR32- WRR64- WRR128-
                  Ctrl:   ArbSelect=Fixed
                  Status: InProgress-
                  VC0:    Caps:   PATOffset=00 MaxTimeSlots=1 RejSnoopTrans-
                          Arb:    Fixed- WRR32- WRR64- WRR128- TWRR128- WRR256-
                          Ctrl:   Enable+ ID=0 ArbSelect=Fixed TC/VC=01
                          Status: NegoPending- InProgress-
                  VC1:    Caps:   PATOffset=00 MaxTimeSlots=1 RejSnoopTrans-
                          Arb:    Fixed- WRR32- WRR64- WRR128- TWRR128- WRR256-
                          Ctrl:   Enable+ ID=1 ArbSelect=Fixed TC/VC=80
                          Status: NegoPending- InProgress-
          Capabilities: [130 v1] Root Complex Link
                  Desc:   PortNumber=0f ComponentID=00 EltType=Config
                  Link0:  Desc:   TargetPort=00 TargetComponent=00 AssocRCRB- LinkType=MemMapped LinkValid+
                          Addr:   00000000fed1c000
          Kernel driver in use: snd_hda_intel

  lsb_release -a output

  LSB Version:    core-2.0-amd64:core-2.0-noarch:core-3.0-amd64:core-3.0-noarch:core-3.1-amd64:core-3.1-noarch:core-3.2-amd64:core-3.2-noarch:core-4.0-amd64:core-4.0-noarch:core-4.1-amd64:core-4.1-noarch:cxx-3.0-amd64:cxx-3.0-noarch:cxx-3.1-amd64:cxx-3.1-noarch:cxx-3.2-amd64:cxx-3.2-noarch:cxx-4.0-amd64:cxx-4.0-noarch:cxx-4.1-amd64:cxx-4.1-noarch:desktop-3.1-amd64:desktop-3.1-noarch:desktop-3.2-amd64:desktop-3.2-noarch:desktop-4.0-amd64:desktop-4.0-noarch:desktop-4.1-amd64:desktop-4.1-noarch:graphics-2.0-amd64:graphics-2.0-noarch:graphics-3.0-amd64:graphics-3.0-noarch:graphics-3.1-amd64:graphics-3.1-noarch:graphics-3.2-amd64:graphics-3.2-noarch:graphics-4.0-amd64:graphics-4.0-noarch:graphics-4.1-amd64:graphics-4.1-noarch:languages-3.2-amd64:languages-3.2-noarch:languages-4.0-amd64:languages-4.0-noarch:languages-4.1-amd64:languages-4.1-noarch:multimedia-3.2-amd64:multimedia-3.2-noarch:multimedia-4.0-amd64:multimedia-4.0-noarch:multimedia-4.1-amd64:multimedia-4.1-noarch:printing-3.2-amd64:printing-3.2-noarch:printing-4.0-amd64:printing-4.0-noarch:printing-4.1-amd64:printing-4.1-noarch:qt4-3.1-amd64:qt4-3.1-noarch:security-4.0-amd64:security-4.0-noarch:security-4.1-amd64:security-4.1-noarch
  Distributor ID: Ubuntu
  Description:    Ubuntu 15.10
  Release:        15.10
  Codename:       wily

  dmesg output :

  [   31.491531] dcdbas dcdbas: Dell Systems Management Base Driver (version 5.6.0-3.2)
  [   31.530015] snd_hda_codec_realtek hdaudioC0D0: autoconfig for ALC888: line_outs=4 (0x14/0x15/0x16/0x17/0x0) type:line
  [   31.530021] snd_hda_codec_realtek hdaudioC0D0:    speaker_outs=0 (0x0/0x0/0x0/0x0/0x0)
  [   31.530024] snd_hda_codec_realtek hdaudioC0D0:    hp_outs=1 (0x1b/0x0/0x0/0x0/0x0)
  [   31.530026] snd_hda_codec_realtek hdaudioC0D0:    mono: mono_out=0x0
  [   31.530028] snd_hda_codec_realtek hdaudioC0D0:    dig-out=0x11/0x1e
  [   31.530030] snd_hda_codec_realtek hdaudioC0D0:    inputs:
  [   31.530034] snd_hda_codec_realtek hdaudioC0D0:      Front Mic=0x19
  [   31.530037] snd_hda_codec_realtek hdaudioC0D0:      Rear Mic=0x18
  [   31.530039] snd_hda_codec_realtek hdaudioC0D0:      Line=0x1a
  [   31.544876] input: HDA Intel Front Mic as /devices/pci0000:00/0000:00:1b.0/sound/card0/input8
  [   31.544987] input: HDA Intel Rear Mic as /devices/pci0000:00/0000:00:1b.0/sound/card0/input9
  [   31.545100] input: HDA Intel Line as /devices/pci0000:00/0000:00:1b.0/sound/card0/input10
  [   31.545209] input: HDA Intel Line Out Front as /devices/pci0000:00/0000:00:1b.0/sound/card0/input11
  [   31.545326] input: HDA Intel Line Out Surround as /devices/pci0000:00/0000:00:1b.0/sound/card0/input12
  [   31.545459] input: HDA Intel Line Out CLFE as /devices/pci0000:00/0000:00:1b.0/sound/card0/input13
  [   31.545592] input: HDA Intel Line Out Side as /devices/pci0000:00/0000:00:1b.0/sound/card0/input14
  [   31.545689] input: HDA Intel Front Headphone as /devices/pci0000:00/0000:00:1b.0/sound/card0/input15
  [   31.554769] gpio_ich: GPIO from 451 to 511 on gpio_ich

  alsa.conf file:
  options snd-hda-intel model=6stack-dig probe_mask=1

  
  HDA Analyzer AUD_MIX Center:

  Node 0x0e [Audio Mixer] wcaps 0x20010f: Stereo Amp-In Amp-Out
    Control: name="Center Playback Volume", index=0, device=0
      ControlAmp: chs=1, dir=1, idx=0, ofs=0
    Control: name="LFE Playback Volume", index=0, device=0
      ControlAmp: chs=2, dir=1, idx=0, ofs=0
    Amp-In caps: ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1
    Amp-In vals: [0x00 0x00] [0x00 0x00]
    Amp-Out caps: ofs=0x1f, nsteps=0x1f, stepsize=0x05, mute=0
    Amp-Out vals: [0x1f 0x1f]
    Connection: 2
       0x04 0x0b


  
  Please let me know if you need any other data.

  Thanks.

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