Public bug reported:
Setting the volume to 100% on the Master channel of my Terratec Aureon
7.1 Space (ICE1724) equals a gain of +128 dB which makes the sound
distorted:
r...@runescomp:~$ amixer -c 1 sset Master 100%
Simple mixer control 'Master',0
Capabilities: pvolume pswitch
Playback channels: Front Left - Front Right
Limits: Playback 0 - 255
Mono:
Front Left: Playback 255 [100%] [128.00dB] [on]
Front Right: Playback 255 [100%] [128.00dB] [on]
0 dB gain is around 50% (but not quite):
r...@runescomp:~$ amixer -c 1 sset Master 50%
Simple mixer control 'Master',0
Capabilities: pvolume pswitch
Playback channels: Front Left - Front Right
Limits: Playback 0 - 255
Mono:
Front Left: Playback 128 [50%] [1.00dB] [on]
Front Right: Playback 128 [50%] [1.00dB] [on]
r...@runescomp:~$ amixer -c 1 sset Master 0dB
Simple mixer control 'Master',0
Capabilities: pvolume pswitch
Playback channels: Front Left - Front Right
Limits: Playback 0 - 255
Mono:
Front Left: Playback 127 [50%] [0.00dB] [on]
Front Right: Playback 127 [50%] [0.00dB] [on]
r...@runescomp:~$ lsb_release -rd
Description: Ubuntu karmic (development branch)
Release: 9.10
r...@runescomp:~$ apt-cache policy alsa-base
alsa-base:
Installed: 1.0.20+dfsg-1ubuntu4
Candidate: 1.0.20+dfsg-1ubuntu4
Version table:
*** 1.0.20+dfsg-1ubuntu4 0
500 http://archive.ubuntu.com karmic/main Packages
100 /var/lib/dpkg/status
ProblemType: Bug
Architecture: i386
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: rune 2436 F.... pulseaudio
/dev/snd/controlC1: rune 2436 F.... pulseaudio
Card0.Amixer.info:
Card hw:0 'Intel'/'HDA Intel at 0xfdff8000 irq 22'
Mixer name : 'Realtek ALC888'
Components : 'HDA:10ec0888,147b0000,00100001'
Controls : 40
Simple ctrls : 22
Card1.Amixer.info:
Card hw:1 'T71Space'/'Terratec Aureon 7.1-Space at 0xbf00, irq 22'
Mixer name : 'ICE1724 - multitrack'
Components : ''
Controls : 56
Simple ctrls : 33
Card2.Amixer.info:
Card hw:2 'HDMI'/'HDA ATI HDMI at 0xfdcfc000 irq 17'
Mixer name : 'ATI R6xx HDMI'
Components : 'HDA:1002aa01,00aa0100,00100000'
Controls : 4
Simple ctrls : 1
Card2.Amixer.values:
Simple mixer control 'IEC958',0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [off]
Date: Wed Sep 30 22:12:52 2009
DistroRelease: Ubuntu 9.10
NonfreeKernelModules: kvm_intel kvm fglrx
Package: alsa-base 1.0.20+dfsg-1ubuntu4
PackageArchitecture: all
ProcEnviron:
LANG=en_DK.UTF-8
SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-11.36-generic
SourcePackage: alsa-driver
Uname: Linux 2.6.31-11-generic i686
UserAsoundrc:
# ALSA library configuration file
# Include settings that are under the control of asoundconf(1).
# (To disable these settings, comment out this line.)
</home/rune/.asoundrc.asoundconf>
** Affects: alsa-driver (Ubuntu)
Importance: Undecided
Status: New
** Tags: apport-bug i386
--
[karmic] 100% volume corresponds to +128 dB gain (distorted sound)
https://bugs.launchpad.net/bugs/439619
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