try latest driver https://wiki.ubuntu.com/Audio/UpgradingAlsa/DKMS
you have to report to alsa devel mailing list if pin ctls of speaker node still change to 0x00 -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to pulseaudio in Ubuntu. https://bugs.launchpad.net/bugs/1208218 Title: intermittent left-channel audio distortion Status in “pulseaudio” package in Ubuntu: New Bug description: Since I installed this version of Ubuntu (Xubuntu 12.04 upgraded to Ubuntu Studio), I occasionally get crackly or fuzzy distortion in the left audio channel. It doesn't happen completely consistently, but it often happens while playing Flash videos in Firefox or editing audio in Audacity. It also happens pretty much every time I try to use Pure Data with JACK, and I can also replicate it by opening Audacity while using JACK (which will create distortion in all audio playing through JACK). But JACK doesn't need to be running at all for the problem to occur. Entering this command: rm -r ~/.pulse ~/.asound* ~/.pulse-cookie in the terminal is the only way I can fix the problem, and sometimes it takes several tries. I also have to restart some open applications after doing that to get them to play audio again. I tried the suggestions on https://wiki.ubuntu.com/Audio/PositionReporting , but that didn't solve the problem. I have PulseAudio 1:1.1-0ubuntu15.3 installed. ProblemType: Bug DistroRelease: Ubuntu 12.04 Package: pulseaudio 1:1.1-0ubuntu15.3 ProcVersionSignature: Ubuntu 3.2.0-51.53-lowlatency 3.2.48 Uname: Linux 3.2.0-51-lowlatency x86_64 AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24. ApportVersion: 2.0.1-0ubuntu17.3 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: stefan 2004 F.... xfce4-volumed stefan 2051 F.... pulseaudio Card0.Amixer.info: Card hw:0 'SB'/'HDA ATI SB at 0xfe7f4000 irq 16' Mixer name : 'Realtek ALC892' Components : 'HDA:10ec0892,18491892,00100302' Controls : 41 Simple ctrls : 20 CurrentDmesg: [ 38.380324] ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready [ 48.962046] eth0: no IPv6 routers present Date: Sun Aug 4 13:13:19 2013 InstallationMedia: Xubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120822.1) MarkForUpload: True ProcEnviron: LANGUAGE=en_US:en PATH=(custom, no user) LANG=en_US.UTF-8 SHELL=/bin/bash SourcePackage: pulseaudio UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 06/24/2010 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: P1.20 dmi.board.name: 880GXH/USB3 dmi.board.vendor: ASRock dmi.chassis.asset.tag: To Be Filled By O.E.M. dmi.chassis.type: 3 dmi.chassis.vendor: To Be Filled By O.E.M. dmi.chassis.version: To Be Filled By O.E.M. dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP1.20:bd06/24/2010:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rn880GXH/USB3:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.: dmi.product.name: To Be Filled By O.E.M. dmi.product.version: To Be Filled By O.E.M. dmi.sys.vendor: To Be Filled By O.E.M. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1208218/+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
