X220 in dock doesn't mute external speakers when headphones connected

[Will Cooke]

This worked in 14.04, and now "doesn't" in 16.04.

Steps to reproduce:

Have external speakers connected via the 3.5mm jack on the docking station and have the computer docked.
Listen to some music.
Notice that it's coming out of the external speakers.
Plug headphones in to the 3.5mm jack on the laptop itself.
Notice that music comes from the external speakers *and* the headphones.
In the past the external speakers would have muted (I am 99% sure this is the case, but I will test with a live 14.04 image and report back) and the audio would have only come out of the headphones.

I note that in the sound settings panel the external speakers are identified as "Headphones".
---
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: will 4045 F.... pulseaudio
CurrentDesktop: Unity
DistroRelease: Ubuntu 16.04
EcryptfsInUse: Yes
InstallationDate: Installed on 2016-04-22 (152 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
Package: alsa-driver (not installed)
ProcVersionSignature: Ubuntu 4.4.0-38.57-generic 4.4.19
Tags: xenial
Uname: Linux 4.4.0-38-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dialout dip lpadmin plugdev sambashare sudo vboxusers
_MarkForUpload: True
dmi.bios.date: 07/07/2011
dmi.bios.vendor: LENOVO
dmi.bios.version: 8DET50WW (1.20 )
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:bvr8DET50WW(1.20):bd07/07/2011:svnLENOVO:pn4287CTO:pvrThinkPadX220:rvnLENOVO:rn4287CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 4287CTO
dmi.product.version: ThinkPad X220
dmi.sys.vendor: LENOVO

[Will Cooke (willcooke)]

Added to Trello: https://trello.com/c/XFdEHx4w/17-bug-1626005-x220-in-dock-doesn-t-mute-external-speakers-when-headphones-connected

[Luke Yelavich (themuso)]

Could you plesae run apport-collect 1626005 so I can get some hardware info?

Thanks.

[Will Cooke (willcooke)]

apport information

[Will Cooke (willcooke)]

apport information

[Will Cooke (willcooke)]

apport information

[Will Cooke (willcooke)]

apport information

[Will Cooke (willcooke)]

apport information

[Luke Yelavich (themuso)]

You could either install/boot yakkety from live media, and see if the same problem exists there, or you could upgrade ALSA hd audio drviers, https://wiki.ubuntu.com/Audio/UpgradingAlsa/DKMS.