Public bug reported:
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
** Affects: alsa-driver (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug precise
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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
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