Public bug reported:

After upgrading to 9.10 sound doesn't work properly anymore. After
periods of silence I have no audio output. Instead I hear a clicking
noise periodically. Behaves like something is suspended and doesn't come
back again. I have experimented with pulling the external speaker jack
on my notebook, deleting ~/.pulse*, and starting me-tv. Normally I get
sound again, especially me-tv seems to initialize the audio-subsystem
correctly again (if the jack is pulled) but no clear pattern has emerged
yet.  After I have sound on internal speakers I can plug in the external
ones and sound works again until the next quit period. Find attached a
log file while I was able to regain output ( pulseaudio -vvvv >
pulse.log 2>&1)
ProblemType: Bug
Architecture: i386
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC1:  tobias     4065 F.... pulseaudio
 /dev/snd/controlC0:  tobias     4065 F.... pulseaudio
 /dev/snd/pcmC0D0p:   tobias     4065 F...m pulseaudio
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xdc240000 irq 22'
   Mixer name   : 'Conexant CX20549 (Venice)'
   Components   : 'HDA:14f15045,173410ad,00100100'
   Controls      : 18
   Simple ctrls  : 8
Card1.Amixer.info:
 Card hw:1 'HVR900'/'WinTV HVR-900 at usb-0000:00:1d.7-2, high speed'
   Mixer name   : 'USB Mixer'
   Components   : 'USB2040:6500'
   Controls      : 2
   Simple ctrls  : 1
Card1.Amixer.values:
 Simple mixer control 'PCM',0
   Capabilities: cvolume cvolume-joined cswitch cswitch-joined
   Capture channels: Mono
   Limits: Capture 0 - 16
   Mono: Capture 13 [81%] [10.00dB] [on]
Date: Sun Nov 22 20:46:58 2009
DistroRelease: Ubuntu 9.10
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release i386 (20091028.5)
Package: alsa-base 1.0.20+dfsg-1ubuntu5
PackageArchitecture: all
ProcEnviron:
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-14.48-generic
SourcePackage: alsa-driver
Uname: Linux 2.6.31-14-generic i686

** Affects: alsa-driver (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug i386

-- 
After upgrade to 9.10: Sound stops working after quiet periods 
https://bugs.launchpad.net/bugs/486808
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