Card sliders after disconnecting usb dock

** Attachment added: "cards-after.png"
   
https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1295173/+attachment/4034042/+files/cards-after.png

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https://bugs.launchpad.net/bugs/1295173

Title:
  [USB-Audio - Kensington USB3.0 Video Dock, playback] volume problem

Status in “alsa-driver” package in Ubuntu:
  New

Bug description:
  1) Ubuntu version:

  Using 14.04. Issues were introduced after upgrade from 13.10

  $ uname -a
  Linux jonas-xps 3.13.0-18-generic #38-Ubuntu SMP Mon Mar 17 21:40:06 UTC 2014 
x86_64 x86_64 x86_64 GNU/Linux

  2) Alsa version:

  alsa-base:
    Installed: 1.0.25+dfsg-0ubuntu4

  3) What I expected to happen

  When disconnecting my Kensington USB dock[1], which has an external sound 
card, I expected volumes to either:
  - Remain the same as they were before the disconnect [3][4]
  - Volumes to be adjusted to 50% or some other saner value than 100%

  4) What happened instead

  When disconnecting the USB dock, all volumes are set to 100%[5],
  including application volumes[2].

  Additionally, the external sound card is not selected in gnome-
  control-center[5] (see #1250759) and the card volume slider has no
  effect.

  [1] 
http://www.kensington.com/kensington/en/gb/p/1504/K33970EU/usb-3-0-docking-station-with-dvi-hdmi-vga-video-.aspx#.UysBmqaVuSQ
  [2] https://launchpadlibrarian.net/170133327/app-sliders-after.png
  [3] https://launchpadlibrarian.net/170133403/app-sliders-before.png
  [4] https://launchpadlibrarian.net/170133403/app-sliders-before.png
  [5] https://launchpadlibrarian.net/170133411/cards-after.png

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu4
  ProcVersionSignature: Ubuntu 3.13.0-18.38-generic 3.13.6
  Uname: Linux 3.13.0-18-generic x86_64
  ApportVersion: 2.13.3-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  jonas      2322 F.... pulseaudio
   /dev/snd/pcmC1D0p:   jonas      2322 F...m pulseaudio
   /dev/snd/controlC0:  jonas      2322 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Thu Mar 20 15:50:57 2014
  DistributionChannelDescriptor:
   # This is a distribution channel descriptor
   # For more information see 
http://wiki.ubuntu.com/DistributionChannelDescriptor
   canonical-oem-somerville-precise-amd64-20120703-2
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2013-08-27 (205 days ago)
  InstallationMedia: Ubuntu 12.04 "Precise" - Build amd64 LIVE Binary 
20120703-15:08
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_Card: Kensington USB3.0 Video Dock - Kensington USB3.0 Video Dock
  Symptom_Type: Volume slider, or mixer problems
  Title: [USB-Audio - Kensington USB3.0 Video Dock, playback] volume slider 
problem
  UpgradeStatus: Upgraded to trusty on 2014-03-20 (0 days ago)
  dmi.bios.date: 05/15/2013
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A09
  dmi.board.name: 0PJHXN
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: 0.1
  dmi.modalias: 
dmi:bvnDellInc.:bvrA09:bd05/15/2013:svnDellInc.:pnDellSystemXPSL322X:pvr:rvnDellInc.:rn0PJHXN:rvrA00:cvnDellInc.:ct8:cvr0.1:
  dmi.product.name: Dell System XPS L322X
  dmi.sys.vendor: Dell Inc.

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