** Summary changed:

- noise when muting PCM volume and audio is playing
+ noise (crackling) when muting PCM volume and audio is playing

** Description changed:

  When PCM volume is muted and some audio is playing, I hear noise through
  front and LFE speakers (or earphones when plugged in). If no audio is
  playing, I don't hear the noise.
+ 
+ NOTE: that we have been seeing PCM channels becoming muted during
+ updates without user intervention so it is worth checking your Alsa PCM
+ mixer level if you are suddenly getting crackling sound when sound is
+ supposed to be being produced.
  
  Individually muting Master (which control front speakers) or LFE volume,
  I can't hear the noise. PCM volume controls both front and LFE speakers
  simultaneously.
  
  ProblemType: Bug
  Architecture: i386
  DistroRelease: Ubuntu 8.10
  Package: linux-image-2.6.27-3-generic 2.6.27-3.4 [modified: 
lib/modules/2.6.27-3-generic/modules.pcimap 
lib/modules/2.6.27-3-generic/modules.dep 
lib/modules/2.6.27-3-generic/modules.ieee1394map 
lib/modules/2.6.27-3-generic/modules.usbmap 
lib/modules/2.6.27-3-generic/modules.isapnpmap 
lib/modules/2.6.27-3-generic/modules.seriomap 
lib/modules/2.6.27-3-generic/modules.alias 
lib/modules/2.6.27-3-generic/modules.symbols]
  ProcCmdLine: root=UUID=0fba0e14-cec6-4293-82ea-81d8896a607b ro
  ProcEnviron:
   PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcVersionSignature: Ubuntu 2.6.27-3.4-generic
  SourcePackage: linux

-- 
noise (crackling) when muting PCM volume and audio is playing
https://bugs.launchpad.net/bugs/272321
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