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 -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to alsa-driver in Ubuntu. 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. 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