How did you test ? When there is hardware low pass filter and downmix widget,
Converter: stream=1, channel=0 Subwoofer channel. Is same as speaker When there is no hardware low pass filter, channel=1 and you need pulseaudio to provide software lowpass filter and downmixing Node 0x02 [Audio Output] wcaps 0x41d: Stereo Amp-Out Control: name="Front Playback Volume", index=0, device=0 ControlAmp: chs=3, dir=Out, idx=0, ofs=0 Device: name="ALC233 Analog", type="Audio", device=0 Amp-Out caps: ofs=0x57, nsteps=0x57, stepsize=0x02, mute=0 Amp- Out vals: [0x57 0x57] Converter: stream=1, channel=0 PCM: rates [0x60]: 44100 48000 bits [0xe]: 16 20 24 formats [0x1]: PCM Power states: D0 D1 D2 D3 EPSS Power: setting=D0, actual=D0 Node 0x03 [Audio Output] wcaps 0x41d: Stereo Amp-Out Control: name="Bass Speaker Playback Volume", index=0, device=0 ControlAmp: chs=3, dir=Out, idx=0, ofs=0 Amp-Out caps: ofs=0x57, nsteps=0x57, stepsize=0x02, mute=0 Amp-Out vals: [0x57 0x57] Converter: stream=1, channel=0 PCM: rates [0x60]: 44100 48000 bits [0xe]: 16 20 24 formats [0x1]: PCM Power states: D0 D1 D2 D3 EPSS -- 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/1553685 Title: Lenovo Y700-17ISK subwoofer doesn't work Status in alsa-driver package in Ubuntu: Incomplete Bug description: Lenovo Y700-17ISK (Intel Core i7-6700HQ/RAM 16GB/SSD 512GB/Nvidia GTX960M 4GB) Operating system: Ubuntu 16.04 (xenial-desktop-amd64.iso 04-Mar-2016, kernel 4.4.0-10-generic, nvidia 361.28) Problem: Notebook subwoofer doesn't work. Judging from alsa-info.sh output, there is no pin declared for the bass output by BIOS. Please find a zip file attached: 'alsa-info_hdajackretask-unconnected-pins' ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: linux-image-4.4.0-10-generic 4.4.0-10.25 ProcVersionSignature: Ubuntu 4.4.0-10.25-generic 4.4.3 Uname: Linux 4.4.0-10-generic x86_64 ApportVersion: 2.20-0ubuntu3 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: aljosa 1776 F.... pulseaudio CurrentDesktop: Unity Date: Sun Mar 6 11:02:21 2016 HibernationDevice: RESUME=UUID=ac022671-63df-40ae-bffe-66fff3b35125 InstallationDate: Installed on 2016-03-05 (0 days ago) InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160304) MachineType: LENOVO 80Q0 ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-10-generic.efi.signed root=UUID=aa4325c4-4b4c-4372-b8ca-a66c3e5b2aa6 ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-4.4.0-10-generic N/A linux-backports-modules-4.4.0-10-generic N/A linux-firmware 1.156 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 01/31/2016 dmi.bios.vendor: LENOVO dmi.bios.version: CDCN30WW dmi.board.asset.tag: NO Asset Tag dmi.board.name: Allsparks 7A dmi.board.vendor: LENOVO dmi.board.version: NO DPK dmi.chassis.asset.tag: NO Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: Lenovo ideapad Y700-17ISK dmi.modalias: dmi:bvnLENOVO:bvrCDCN30WW:bd01/31/2016:svnLENOVO:pn80Q0:pvrLenovoideapadY700-17ISK:rvnLENOVO:rnAllsparks7A:rvrNODPK:cvnLENOVO:ct10:cvrLenovoideapadY700-17ISK: dmi.product.name: 80Q0 dmi.product.version: Lenovo ideapad Y700-17ISK dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1553685/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
