[Pkg-alsa-devel] Bug#260445: alsa-base: Loss of left channel

[Paul Gotch]

Package: alsa-base
Version: 1.0.5a-1
Severity: normal

Every so often I lose the left hand channel of sound completely. If this
happens is appears to come back if I use alsamixer to pull the gain on the
control labled "DAC" to minimum then back up to maxmimum.

AlsaMixer is reporting a CS4297A rev 4. I believe this is a bug in ALSA as
there is a post on the alsa-user mailing list from someone who's seen the
same problems however there is no upstream bug report
http://www.mail-archive.com/alsa-user@lists.sourceforge.net/msg09393.html

Fixing the lack of sound in this way appears to cause a secondary problem
of high background noise levels which sounds like resampling noise. There
is a bug in the ALSA database about noise when down sampling 
https://bugtrack.alsa-project.org/alsa-bug/bug_view_page.php?bug_id=0000385
hwever in my case upsampling from 44.1KHz to 48KHz will be happening.

-- System Information:
Debian Release: testing/unstable
  APT prefers testing
  APT policy: (700, 'testing'), (600, 'unstable')
Architecture: i386 (i686)
Kernel: Linux 2.6.5
Locale: LANG=en_GB, LC_CTYPE=en_GB

Versions of packages alsa-base depends on:
ii  alsa-utils                    1.0.5-1    Advanced Linux Sound Architecture 
ii  debconf                       1.4.29     Debian configuration management sy
ii  debianutils                   2.8.3      Miscellaneous utilities specific t
ii  module-init-tools             3.1-pre5-1 tools for managing Linux kernel mo
ii  modutils                      2.4.26-1   Linux module utilities
ii  psmisc                        21.5-1     Utilities that use the proc filesy

-- debconf information:
  alsa-common/card-list:
* alsa-base/current_card: done
  alsa-base/alsactl_store_on_shutdown: autosave always
  alsa-base/card_list: cs46xx done