[HDA-Intel - HDA Intel PCH, recording] Clipped audio output added to mic recording when docked

[agoodm]

Hi,

I have a Lenovo X220 with an mini dock series 3 plus. Ever since I have been using Ubuntu (originally 12.04 and more recently a clean 14.04 install) I have issues with recording sound from the docking station.

To elaborate plugging the devices in as follows works as expected:
Mic into docking base
Headset into laptops headset socket (a combined headset/mic socket)

However when I connect both the headphones and the mic to the docking base a garbled representation of the output audio is mixed with the otherwise good quality input.

I have tried to demonstrate this during the bug report process. I had music playing during the sound recording tests. During the first test the music playback stopped on its own and good quality sound was recorded. During the second test music resumed and I talked over it at the end... Hopefully this helps clarify my explanation.

Alan

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: pulseaudio 1:4.0-0ubuntu11
ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
Uname: Linux 3.13.0-32-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.2
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: alan 2596 F.... pulseaudio
 /dev/snd/controlC0: alan 2596 F.... pulseaudio
CurrentDesktop: Unity
Date: Mon Aug 4 18:52:04 2014
InstallationDate: Installed on 2014-07-27 (8 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
SourcePackage: pulseaudio
Symptom: audio
Symptom_AlsaRecordingTest: ALSA recording test through plughw:PCH successful
Symptom_Card: LifeCam Studio - Microsoft® LifeCam Studio(TM)
Symptom_PulseAudioRecordingTest: PulseAudio recording test through plughw:PCH failed
Symptom_Type: High background noise, or volume is too low
Title: [HDA-Intel - HDA Intel PCH, recording] Background noise or low volume
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/03/2012
dmi.bios.vendor: LENOVO
dmi.bios.version: 8DET65WW (1.35 )
dmi.board.asset.tag: Not Available
dmi.board.name: 4287CTO
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:bvr8DET65WW(1.35):bd10/03/2012:svnLENOVO:pn4287CTO:pvrThinkPadX220:rvnLENOVO:rn4287CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 4287CTO
dmi.product.version: ThinkPad X220
dmi.sys.vendor: LENOVO

[Raymond (superquad-vortex2)]

you have to provide verbose pulseaudio log

do you mean Mic is switch between internal Mic and dock Mic since external Mic is unplugged ?

driver and pulseaudio need to check both ext Mic and dock Mic to decide the Mic selection

[agoodm (alan-goodmanemail)]

Please link to a tutorial for generating the verbose log file?

Mic switching between the ports seems to work fine, but when both devices are plugged into the dock a distorted representation of what is playing through the output device is mixed with the mic audio.

[Raymond (superquad-vortex2)]

https://wiki.ubuntu.com/PulseAudio/Log