Summarizing, to fix sound distortion it's necessary to apply two fixes, one for alsa and other for pulseaudio. Pulse config change retains after reboot and possibly "survives" pulseaudio package upgrade(s).
Alsa need mute fix to be re-applied after reboot, and it can be done automatically. Add line /usr/bin/amixer -c 2 sset 'Auto-Mute Mode' 'Disabled' > /dev/null to /etc/rc.local file before line "exit 0", where "-c 2" is number of sound card in my system and may vary in yours. -- 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/1203235 Title: [H87N-WIFI, Realtek ALC892, Green Line Out, Rear] Underruns, dropouts or crackling sound Status in “alsa-driver” package in Ubuntu: Confirmed Bug description: Out of the box, ubuntu has intermittent crackling sounds on this hardware. I've tried turning off other sound devices, switching fully to ALSA, tweaking config files with stuff described here: https://wiki.ubuntu.com/Audio/PositionReporting and various other things. Nothing seems to alleviate the issues of crackling sound. ProblemType: Bug DistroRelease: Ubuntu 13.04 Package: alsa-base 1.0.25+dfsg-0ubuntu4 ProcVersionSignature: Ubuntu 3.8.0-26.38-generic 3.8.13.2 Uname: Linux 3.8.0-26-generic x86_64 ApportVersion: 2.9.2-0ubuntu8.1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC2: brian 1732 F.... pulseaudio /dev/snd/controlC1: brian 1732 F.... pulseaudio /dev/snd/controlC0: brian 1732 F.... pulseaudio Date: Fri Jul 19 23:22:05 2013 InstallationDate: Installed on 2013-07-15 (4 days ago) InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424) MarkForUpload: True 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: Green Line Out, Rear Symptom_Type: Underruns, dropouts, or "crackling" sound Title: [H87N-WIFI, Realtek ALC892, Green Line Out, Rear] Underruns, dropouts or crackling sound UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 05/07/2013 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: F1 dmi.board.asset.tag: To be filled by O.E.M. dmi.board.name: H87N-WIFI dmi.board.vendor: Gigabyte Technology Co., Ltd. dmi.board.version: x.x dmi.chassis.asset.tag: To Be Filled By O.E.M. dmi.chassis.type: 3 dmi.chassis.vendor: Gigabyte Technology Co., Ltd. dmi.chassis.version: To Be Filled By O.E.M. dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrF1:bd05/07/2013:svnGigabyteTechnologyCo.,Ltd.:pnH87N-WIFI:pvrTobefilledbyO.E.M.:rvnGigabyteTechnologyCo.,Ltd.:rnH87N-WIFI:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvrToBeFilledByO.E.M.: dmi.product.name: H87N-WIFI dmi.product.version: To be filled by O.E.M. dmi.sys.vendor: Gigabyte Technology Co., Ltd. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1203235/+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
