The volume controls only change the left channel ; the right channel stays at full volume. The only exception is when reaching 0% volume, where both channels are muted.
These forum posts seem to be showing the same issue (they're a bit old, though):
http://ubuntuforums.org/showpost.php?p=10069781&postcount=239
http://ubuntuforums.org/showpost.php?p=10070100&postcount=240
ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: alsa-base 1.0.24+dfsg-0ubuntu1
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic x86_64
NonfreeKernelModules: nvidia
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Architecture: amd64
ArecordDevices:
**** List of CAPTURE Hardware Devices ****
card 1: USB [E-MU 0404 | USB], device 0: USB Audio [USB Audio]
Subdevices: 1/1
Subdevice #0: subdevice #0
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: niko 3566 F.... pulseaudio
/dev/snd/pcmC1D0p: niko 3566 F...m pulseaudio
Card1.Amixer.info:
Card hw:1 'USB'/'E-MU Systems, Inc. E-MU 0404 | USB at usb-0000:00:04.1-3.2, high speed'
Mixer name : 'USB Mixer'
Components : 'USB041e:3f04'
Controls : 6
Simple ctrls : 5
Date: Fri Jun 3 21:35:18 2011
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110426)
PackageArchitecture: all
PciMultimedia:
ProcEnviron:
LANGUAGE=fr_FR:en
PATH=(custom, user)
LANG=fr_FR.UTF-8
SHELL=/bin/bash
SourcePackage: alsa-driver
Symptom: audio
Symptom_Card: E-Mu 0404 - E-MU 0404 | USB
Symptom_Type: Volume slider, or mixer problems
Title: [USB-Audio - E-MU 0404 | USB, playback] volume slider problem
UpgradeStatus: No upgrade log present (probably fresh install)
UserAsoundrc:
dmi.bios.date: 09/11/2008
dmi.bios.vendor: Phoenix Technologies, LTD
dmi.bios.version: ASUS P5N73-CM ACPI BIOS Revision 0114
dmi.board.name: P5N73-CM
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: 1.XX
dmi.chassis.asset.tag: 123456789000
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnPhoenixTechnologies,LTD:bvrASUSP5N73-CMACPIBIOSRevision0114:bd09/11/2008:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP5N73-CM:rvr1.XX:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer
Thanks for your bug report. What volume controls are you talking about? if you adjust the volume from the sound menu, does the same problem occur?
Please try adjusting the master volume in alsamixer. Open a terminal, and run alsamixer, then use the up and down arrows to change the master volume. Please report back as to whether the same thing happens when using alsamixer.
Thanks.