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** Changed in: alsa-driver (Ubuntu) Status: New => Incomplete -- 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/1000734 Title: [HDA-Intel - HDA Intel PCH, playback] Dock audio output has background crackle, worse with CPU/disk/USB activity Status in alsa-driver package in Ubuntu: Incomplete Bug description: This machine (Thinkpad T520) is connected to a Lenovo Advanced Mini Dock Series 3 (?), marked "type 4337". The dock has a green 3.5mm stereo audio output on the back, which has a background crackle that the output on the side of the laptop doesn't. The crackle is loud enough to be noticeable, although audio can otherwise be heard clearly, and is somewhat worse when the mouse (USB, connected to dock) is moving, or with CPU or disk (SSD) activity. I'm aware this may just be bad hardware design and not fixable in software. :-) There is a worse bug with HDMI audio output which I am about to report separately. ProblemType: Bug DistroRelease: Ubuntu 12.04 Package: alsa-base 1.0.25+dfsg-0ubuntu1 ProcVersionSignature: Ubuntu 3.2.0-24.37-generic 3.2.14 Uname: Linux 3.2.0-24-generic x86_64 AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24. ApportVersion: 2.0.1-0ubuntu7 Architecture: amd64 ArecordDevices: **** List of CAPTURE Hardware Devices **** card 0: PCH [HDA Intel PCH], device 0: CONEXANT Analog [CONEXANT Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: cmb 2245 F.... xfce4-volumed cmb 2264 F.... pulseaudio /dev/snd/pcmC0D0p: cmb 2264 F...m pulseaudio /dev/snd/controlC29: cmb 2245 F.... xfce4-volumed Card0.Amixer.info: Card hw:0 'PCH'/'HDA Intel PCH at 0xf2620000 irq 45' Mixer name : 'Intel CougarPoint HDMI' Components : 'HDA:14f1506e,17aa21cf,00100000 HDA:14f12c06,17aa2122,00100000 HDA:80862805,80860101,00100000' Controls : 36 Simple ctrls : 13 Card29.Amixer.info: Card hw:29 'ThinkPadEC'/'ThinkPad Console Audio Control at EC reg 0x30, fw unknown' Mixer name : 'ThinkPad EC (unknown)' Components : '' Controls : 1 Simple ctrls : 1 Card29.Amixer.values: Simple mixer control 'Console',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [on] Date: Thu May 17 13:46:54 2012 InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1) PackageArchitecture: all ProcEnviron: LANGUAGE=en_GB:en TERM=xterm PATH=(custom, user) LANG=en_GB.UTF-8 SHELL=/bin/bash SourcePackage: alsa-driver Symptom: audio Symptom_AlsaPlaybackTest: ALSA playback test through plughw:PCH successful Symptom_Card: Built-in Audio - HDA Intel PCH Symptom_PulsePlaybackTest: PulseAudio playback test successful Symptom_Type: High background noise, or volume is too low Title: [HDA-Intel - HDA Intel PCH, playback] Background noise or low volume UpgradeStatus: Upgraded to precise on 2012-05-17 (0 days ago) UserAsoundrc: ctl.!default { type pulse } dmi.bios.date: 05/18/2011 dmi.bios.vendor: LENOVO dmi.bios.version: 8AET46WW (1.26 ) dmi.board.asset.tag: Not Available dmi.board.name: 42433ZG dmi.board.vendor: LENOVO dmi.board.version: Not Available dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: Not Available dmi.modalias: dmi:bvnLENOVO:bvr8AET46WW(1.26):bd05/18/2011:svnLENOVO:pn42433ZG:pvrThinkPadT520:rvnLENOVO:rn42433ZG:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable: dmi.product.name: 42433ZG dmi.product.version: ThinkPad T520 dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1000734/+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