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[aoandr <1498129@xxxxxxxxxxxxxxxxxx>]

As far as I can tell, ALSA is working just fine. The problem is only
with Pulseaudio.

After restarting Pulseaudio with Xonar U7 attached I've got the "Xoanar
U7 Digital (S/PDIF)" choice in the Audio configuration, but this choice
actually selects Analog Output (no signal on digital S/PDIF output, and
the sound is going through analog connectors).

The disconnect message in the quoted above dmesg  is related to my
experiments with attaching and detaching the USB card. It is normal
behaviour.

The apparent problems with unsupported "ctl value" does not affect the functionality of the card in ALSA.
(FYI: I've added "ignore_ctl_error=1" to snd-usb-audio options in modprobe.d/alsa-base.conf to make alsamixer work)

Please, let me know what else I can do to help sort this out.

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https://bugs.launchpad.net/bugs/1498129

Title:
  Asus Xonar U7 S/PDIF output not recognized by pulseaudio

Status in alsa-driver package in Ubuntu:
  Incomplete

Bug description:
  The external USB audio card Asus Xonar U7 is capable of both analog and digital output.
  ALSA name for the digital (S/PDIF) output is hw:1,1, and it is listed in aplay -l output, and aplay can output to it:
  aplay -D plughw:1,1 sample.wav. So, direct alsa sound works fine.

  However, pulseadio does not recognize the digital output of Xonar U7,
  it offers only analog output.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: pulseaudio 1:4.0-0ubuntu11.1
  ProcVersionSignature: Ubuntu 3.13.0-63.103-lowlatency 3.13.11-ckt25
  Uname: Linux 3.13.0-63-lowlatency i686
  ApportVersion: 2.14.1-0ubuntu3.13
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  aoand      3756 F.... pulseaudio
   /dev/snd/controlC0:  aoand      3756 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Mon Sep 21 21:29:54 2015
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2011-02-20 (1674 days ago)
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007.1)
  SourcePackage: pulseaudio
  UpgradeStatus: Upgraded to trusty on 2014-05-19 (490 days ago)
  dmi.bios.date: 11/29/2012
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 7WET71WW (3.21 )
  dmi.board.name: 7448CTO
  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:bvr7WET71WW(3.21):bd11/29/2012:svnLENOVO:pn7448CTO:pvrThinkPadX200Tablet:rvnLENOVO:rn7448CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 7448CTO
  dmi.product.version: ThinkPad X200 Tablet
  dmi.sys.vendor: LENOVO

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