I have the same problem. But I "solved" it disabling the sound card power save: http://www.foxswap.com/computers-and-technology/ubuntu-12-04-clicking-sound-from-speakers/
-- 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/1023617 Title: Crackling Noise - Ubuntu 12.04 Status in “alsa-driver” package in Ubuntu: Confirmed Bug description: I hear a crackling noise each 3 seconds. I have an Acer Aspire 5742G / Realtek ALC272X / Speaker, Internal ProblemType: Bug DistroRelease: Ubuntu 12.04 Package: alsa-base 1.0.25+dfsg-0ubuntu1 ProcVersionSignature: Ubuntu 3.2.0-26.41-generic 3.2.19 Uname: Linux 3.2.0-26-generic x86_64 NonfreeKernelModules: fglrx AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24. ApportVersion: 2.0.1-0ubuntu8 Architecture: amd64 ArecordDevices: **** List of CAPTURE Hardware Devices **** card 0: Intel [HDA Intel], device 0: ALC272X Analog [ALC272X Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: diogosg 2818 F.... pulseaudio /dev/snd/controlC0: diogosg 2818 F.... pulseaudio Card0.Amixer.info: Card hw:0 'Intel'/'HDA Intel at 0xb4100000 irq 43' Mixer name : 'Realtek ALC272X' Components : 'HDA:10ec0272,10250487,00100001' Controls : 21 Simple ctrls : 12 Card1.Amixer.info: Card hw:1 'Generic'/'HD-Audio Generic at 0xb4020000 irq 44' Mixer name : 'ATI R6xx HDMI' Components : 'HDA:1002aa01,00aa0100,00100200' Controls : 6 Simple ctrls : 1 Card1.Amixer.values: Simple mixer control 'IEC958',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [on] Date: Wed Jul 11 22:01:40 2012 InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425) PackageArchitecture: all SourcePackage: alsa-driver Symptom: audio Symptom_AlsaPlaybackTest: ALSA playback test through plughw:Intel successful Symptom_Card: Áudio embutido - HDA Intel Symptom_Jack: Speaker, Internal Symptom_PulsePlaybackTest: PulseAudio playback test successful Symptom_Type: None of the above Title: [Aspire 5742G, Realtek ALC272X, Speaker, Internal] Playback problem UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 11/18/2010 dmi.bios.vendor: Acer dmi.bios.version: V1.10 dmi.board.asset.tag: Base Board Asset Tag dmi.board.name: Aspire 5742G dmi.board.vendor: Acer dmi.board.version: V1.10 dmi.chassis.type: 10 dmi.chassis.vendor: Acer dmi.chassis.version: V1.10 dmi.modalias: dmi:bvnAcer:bvrV1.10:bd11/18/2010:svnAcer:pnAspire5742G:pvrV1.10:rvnAcer:rnAspire5742G:rvrV1.10:cvnAcer:ct10:cvrV1.10: dmi.product.name: Aspire 5742G dmi.product.version: V1.10 dmi.sys.vendor: Acer To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1023617/+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
