This problem was discussed here: https://bugzilla.kernel.org/show_bug.cgi?id=74841.
It also affects Ubuntu 16.04. ** Bug watch added: Linux Kernel Bug Tracker #74841 http://bugzilla.kernel.org/show_bug.cgi?id=74841 -- 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/1500605 Title: [20251, IDT 92HD95, Black Headphone Out, Front] Background noise or low volume Status in alsa-driver package in Ubuntu: Confirmed Bug description: The sound through headphones is terrible under Ubuntu and Windows perfectly on sound ProblemType: Bug DistroRelease: Ubuntu 15.04 Package: alsa-base 1.0.25+dfsg-0ubuntu4 ProcVersionSignature: Ubuntu 3.19.0-15.15-generic 3.19.3 Uname: Linux 3.19.0-15-generic x86_64 NonfreeKernelModules: wl ApportVersion: 2.17.2-0ubuntu1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/pcmC0D0p: bastek 1601 F...m pulseaudio /dev/snd/controlC0: bastek 1601 F.... pulseaudio CurrentDesktop: Unity Date: Mon Sep 28 22:23:15 2015 InstallationDate: Installed on 2015-09-28 (0 days ago) InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422) PackageArchitecture: all SourcePackage: alsa-driver Symptom: audio Symptom_AlsaPlaybackTest: ALSA playback test through plughw:PCH failed Symptom_Card: Built-in Audio - HDA Intel PCH Symptom_Jack: Black Headphone Out, Front Symptom_Type: High background noise, or volume is too low Title: [20251, IDT 92HD95, Black Headphone Out, Front] Background noise or low volume UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 11/19/2013 dmi.bios.vendor: LENOVO dmi.bios.version: 7ACN89WW dmi.board.asset.tag: No Asset Tag dmi.board.name: Ginkgo 7A dmi.board.vendor: LENOVO dmi.board.version: 31900003WIN8 STD MLT dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: Lenovo G700 dmi.modalias: dmi:bvnLENOVO:bvr7ACN89WW:bd11/19/2013:svnLENOVO:pn20251:pvrLenovoG700:rvnLENOVO:rnGinkgo7A:rvr31900003WIN8STDMLT:cvnLENOVO:ct10:cvrLenovoG700: dmi.product.name: 20251 dmi.product.version: Lenovo G700 dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1500605/+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
