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[Benjamin Guy-Williams <699906@xxxxxxxxxxxxxxxxxx>]

I just discovered that using the plugin (Effects-Channel Mixer) will
provide 2 channel output that works with Audacious set to ALSA. It also
doesn't disrupt DTS passthrough for other music, so for now I just left
it ticked and everything is hunky-dory.

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https://bugs.launchpad.net/bugs/699906

Title:
  alsa plugin for audacious fails when using usb audio adapter

Status in audacious-plugins package in Ubuntu:
  Expired

Bug description:
  Binary package hint: audacious-plugins

  When I use the ALSA output plugin with audacious, everything works
  fine on my laptop/netbook.  But I want to have it play out through my
  USB audio adapter, and when I select that output adapter in the list,
  I get this (pop-up) error when trying to play a song:

  snd_pcm_hw_params_set_channels failed: Invalid argument.

  I tried downgrading the kernel in the boot menu, but it didn't help,
  so I grabbed the latest source code (2.4.2) for audacious and the
  plugins, and re-compiled everything using the latest -dev packages
  from the ubuntu repositories.

  The re-compiled latest 2.4.2 code also had the same error.

  Looking in the ALSA source code in the audacious src code ( audacious-
  plugins-2.4.2/src/alsa/alsa.c )  I found the line that contains
  "snd_pcm_hw_params_set_channels", and commented that out, recompiled,
  and everything worked ok (no error, and sound plays fine out my usb
  audio adapter)

  For what it's worth, this error also just crept into my system about a
  month ago- everything was working fine in this configuration until
  then.

  ProblemType: Bug
  DistroRelease: Ubuntu 10.10
  Package: audacious-plugins 2.4.0-0ubuntu3
  ProcVersionSignature: Ubuntu 2.6.35-24.42-generic 2.6.35.8
  Uname: Linux 2.6.35-24-generic i686
  NonfreeKernelModules: wl
  Architecture: i386
  Date: Fri Jan  7 08:35:04 2011
  ProcEnviron:
   PATH=(custom, user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: audacious-plugins

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