you have to open upstream bug report if it is a regression by providing working alsa-info using live cd
http://www.alsa-project.org/pipermail/alsa- devel/2010-January/024624.html -- 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/1516303 Title: [snd-hda-intel] No output sound on HDMI for conexant CX20561 Status in alsa-driver package in Ubuntu: New Bug description: In other LTS ubuntu versions , I can get a HDMI output sound In 10.04 (out the box) In 12.04: need 'options snd-hda-intel model=hp-dv6736' to work In 14.04 not available! Possible regression! ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: alsa-base 1.0.25+dfsg-0ubuntu4 ProcVersionSignature: Ubuntu 3.16.0-39.53~14.04.1-generic 3.16.7-ckt11 Uname: Linux 3.16.0-39-generic x86_64 ApportVersion: 2.14.1-0ubuntu3.18 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: jacsalomon 1843 F.... pulseaudio CurrentDesktop: XFCE Date: Sat Nov 14 13:49:22 2015 InstallationDate: Installed on 2015-10-25 (20 days ago) InstallationMedia: Linux Mint 17.2 "Rafaela" - Release amd64 20150723 PackageArchitecture: all SourcePackage: alsa-driver UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 12/01/2008 dmi.bios.vendor: Phoenix dmi.bios.version: F.2E dmi.board.name: 30CE dmi.board.vendor: Wistron dmi.board.version: 80.52 dmi.chassis.type: 10 dmi.chassis.vendor: Hewlett-Packard dmi.chassis.version: N/A dmi.modalias: dmi:bvnPhoenix:bvrF.2E:bd12/01/2008:svnHewlett-Packard:pnHPPaviliondv2700NotebookPC:pvrF.2E:rvnWistron:rn30CE:rvr80.52:cvnHewlett-Packard:ct10:cvrN/A: dmi.product.name: HP Pavilion dv2700 Notebook PC dmi.product.version: F.2E dmi.sys.vendor: Hewlett-Packard mtime.conffile..etc.modprobe.d.alsa.base.conf: 2015-11-14T13:29:09.262950 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1516303/+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