No upstream bug URL, but a patch has been sent to alsa-devel to fix this
issue: http://mailman.alsa-project.org/pipermail/alsa-
devel/2014-January/071156.html

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https://bugs.launchpad.net/bugs/1268301

Title:
  udev alsa restore restore rules are broken

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

Bug description:
  To reproduce:

  1. Run the following command: udevadm test --action=add
  /class/sound/controlC0 2>/dev/null | grep alsactl

  Expected output:

  run: '/usr/sbin/alsactl restore 0'

  Actual output:

  run: '/usr/sbin/alsactl restore '

  Note the missing '0' - this causes alsactl to restore the levels on
  all cards instead of the one that was just plugged in. The rules file
  looks like this:

  TEST!="/var/lib/alsa/state-daemon.conf", RUN+="/usr/sbin/alsactl
  restore $attr{number}"

  This has not changed since raring (where this stuff works correctly).
  Under saucy the $attr{number} macro expands to empty string.

  udevadm info --query=all --path=/class/sound/controlC0 --attribute-
  walk outputs exactly the same attributes on both saucy and raring.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: alsa-utils 1.0.27.1-1ubuntu1 [modified: 
lib/udev/rules.d/90-alsa-restore.rules usr/sbin/alsactl]
  Uname: Linux 3.11.0-031100-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.12.5-0ubuntu2.2
  Architecture: amd64
  Date: Sun Jan 12 13:06:47 2014
  InstallationDate: Installed on 2013-08-27 (137 days ago)
  InstallationMedia: Xubuntu 13.10 "Saucy Salamander" - Alpha amd64 (20130827)
  MarkForUpload: True
  SourcePackage: alsa-utils
  UpgradeStatus: No upgrade log present (probably fresh install)

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