In Ubuntu  pavolzetor reported:

Hallo, I cannot play volume from only one speaker, it always plays from both

If I try change it to left or right, volume turns off and when I turn it on, it plays from both speakers

ProblemType: Bug
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: CONEXANT Analog [CONEXANT Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: pk 1411 F.... pulseaudio
 /dev/snd/pcmC0D0p: pk 1411 F...m pulseaudio
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xfc020000 irq 17'
   Mixer name : 'Conexant CX20561 (Hermosa)'
   Components : 'HDA:14f15051,17aa2100,00100000 HDA:14f12c06,17aa2122,00100000'
   Controls : 14
   Simple ctrls : 7
Date: Sun Mar 7 15:31:34 2010
DistroRelease: Ubuntu 10.04
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
Package: pulseaudio 1:0.9.22~0.9.21+stable-queue-32-g8478-0ubuntu11
ProcEnviron:
 LANG=sk_SK.utf8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.32-15.22-generic
SourcePackage: pulseaudio
Uname: Linux 2.6.32-15-generic x86_64

http://launchpadlibrarian.net/40420669/AlsaDevices.txt
http://launchpadlibrarian.net/40420670/AplayDevices.txt
http://launchpadlibrarian.net/40420672/Card0.Amixer.values.txt
http://launchpadlibrarian.net/40420673/Card0.Codecs.codec.0.txt
http://launchpadlibrarian.net/40420674/Card0.Codecs.codec.1.txt
http://launchpadlibrarian.net/40420677/PciMultimedia.txt

Launchpad ref: https://bugs.edge.launchpad.net/ubuntu/+source/gnome-media/+bug/533821

Thanks