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[Raymond <1315212@xxxxxxxxxxxxxxxxxx>]

http://www.alsa-project.org/alsa-doc/alsa-lib/pcm_plugins.html

pcm.name {
        type asym               # Asym PCM
        playback STR            # Playback slave name
        # or
        playback {              # Playback slave definition
                pcm STR         # Slave PCM name
                # or
                pcm { }         # Slave PCM definition
        }
        capture STR             # Capture slave name
        # or
        capture {               # Capture slave definition
                pcm STR         # Slave PCM name
                # or
                pcm { }         # Slave PCM definition
        }
}

pcm.NAME {
        type hooks              # PCM with hooks
        slave STR               # Slave name
        # or
        slave {                 # Slave definition
                pcm STR         # Slave PCM name
                # or
                pcm { }         # Slave PCM definition
        }
        hooks {
                ID STR          # Hook name (see pcm_hook)
                # or
                ID { }          # Hook definition (see pcm_hook)
        }
}

you need to put the current ca0106 iec958 slave pcm and hook into
playback slave and create capture slave of asym plugin

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https://bugs.launchpad.net/bugs/1315212

Title:
  [CA0106 - CA0106, playback] Playback problem - Surround dies, no valid
  output

Status in ALSA driver:
  Confirmed
Status in alsa-driver package in Ubuntu:
  Incomplete

Bug description:
  This is tested against a Creative Labs Sounblaster live! (sb0410) card
  and a SoundBlaster Audigy se (sb0570). Both of them behave strangely,
  output coming through some, but not all speakers, etc. This was
  working in 13.10 under the sb0410. the ca0106 driver is the same for
  both cards.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu4
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  Uname: Linux 3.13.0-24-generic i686
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  joshp     30385 F.... pulseaudio
   /dev/snd/controlC0:  joshp     30385 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Thu May  1 21:37:12 2014
  InstallationDate: Installed on 2014-04-28 (3 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release i386 (20140417)
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaPlaybackTest: ALSA playback test through plughw:CA0106 failed
  Symptom_Card: Built-in Audio - Intel ICH6
  Symptom_Type: None of the above
  Title: [CA0106 - CA0106, playback] Playback problem
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/03/2006
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A08
  dmi.board.name: 0G8310
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 3
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA08:bd03/03/2006:svnDellInc.:pnOptiPlexGX280:pvr:rvnDellInc.:rn0G8310:rvr:cvnDellInc.:ct3:cvr:
  dmi.product.name: OptiPlex GX280
  dmi.sys.vendor: Dell Inc.

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