I've also found that whenever i change the hdmi resolution back to one of the resolutions that the tv originally reported, the audio over hdmi begins to work again. if i again change to the the tv native resolution (set with xrandr), the audio over hdmi stops again.
while the audio is not working, in the 'PulseAudio volume control' the output bars are still moving as thought sound is actually playing. full troubleshooting to date is listed here: https://ubuntuforums.org/showthread.php?t=2367418 ** This bug is no longer a duplicate of bug 1533343 No sound from internal speakers after boot with connected headphones -- 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/1606078 Title: No sound with Ubuntu 16.04 Status in alsa-driver package in Ubuntu: Incomplete Bug description: After a fresh install of Ubuntu 16.04.1 on an LG S1 Express Dual laptop there was no sound from the speakers unless external speakers where hooked to the headphones socket. This applies to the Ubuntu Mate, Xubuntu and Lubuntu variants. This laptop was working fine for all previous releases up to 14.04. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: alsa-base 1.0.25+dfsg-0ubuntu5 ProcVersionSignature: Ubuntu 4.4.0-31.50-generic 4.4.13 Uname: Linux 4.4.0-31-generic i686 ApportVersion: 2.20.1-0ubuntu2.1 Architecture: i386 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: bashar 3263 F.... pulseaudio CurrentDesktop: Unity Date: Mon Jul 25 01:51:19 2016 InstallationDate: Installed on 2016-07-24 (0 days ago) InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release i386 (20160719) PackageArchitecture: all ProcEnviron: LANGUAGE=en_US PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash SourcePackage: alsa-driver Symptom: audio Symptom_AlsaPlaybackTest: ALSA playback test through plughw:Intel failed Symptom_Card: Built-in Audio - HDA Intel Symptom_DevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: bashar 3263 F.... pulseaudio Symptom_Jack: Line Out, Internal Symptom_Type: No sound at all Title: [S1-M401E1, Realtek ALC880, Line Out, Internal] No sound at all UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 02/16/2006 dmi.bios.vendor: Phoenix Technologies LTD dmi.bios.version: RKYWSF0B dmi.board.name: ROCKY dmi.board.vendor: LG Electronics dmi.board.version: Not Applicable dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: LG Electronics dmi.chassis.version: N/A dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvrRKYWSF0B:bd02/16/2006:svnLGElectronics:pnS1-M401E1:pvrNotApplicable:rvnLGElectronics:rnROCKY:rvrNotApplicable:cvnLGElectronics:ct10:cvrN/A: dmi.product.name: S1-M401E1 dmi.product.version: Not Applicable dmi.sys.vendor: LG Electronics To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1606078/+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
