I believe this is fixed in the latest version of Ubuntu (both 13.04 and
13.10). Please reopen the bug if it isn't. Thanks!
** Changed in: alsa-driver (Ubuntu)
Status: Confirmed => Fix Released
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https://bugs.launchpad.net/bugs/612125
Title:
[SigmaTel STAC9228] Sound card lies about mixer dB levels
Status in “alsa-driver” package in Ubuntu:
Fix Released
Bug description:
Pulseaudio uses the decibel levels reported by the different driver-
level mixers to combine them into one big mixer. However, the driver
tells dirty lies, causing pulseaudio to misbehave. The root of the
problem is that when any relevant mixer is at zero percent, the sound
will be completely muted, but the driver will report a dB gain value
that indicates otherwise. For example, at zero percent, the Master
mixer reports "-48.00" dB gain. Hence, if pulseaudio attempts to set
any volume level below -48 dB, it will turn the master mixer all the
way down and mute the sound. Hence, the bottom third portion of my
volume slider is completely mute.
The current workaround for this is to use the ignore_db=1 trick in
default.pa. However, maybe pulseaudio needs a config option to specify
the allowed range of each hardware mixer. Then I could tell it to
never set the Master mixer below 5%.
anyway, the bug is that when the hardware mixers are completely
silent, they lie about their dB gain values and thereby confuse
pulseaudio.
ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: alsa-base 1.0.22.1+dfsg-0ubuntu3
ProcVersionSignature: Ubuntu 2.6.32-24.38-preempt 2.6.32.15+drm33.5
Uname: Linux 2.6.32-24-preempt x86_64
NonfreeKernelModules: wl nvidia
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: ryan 23668 F.... pulseaudio
Card0.Amixer.info:
Card hw:0 'Intel'/'HDA Intel at 0xf6ffc000 irq 21'
Mixer name : 'SigmaTel STAC9228'
Components : 'HDA:83847616,10280209,00100402'
Controls : 28
Simple ctrls : 18
Date: Sat Jul 31 12:34:22 2010
PackageArchitecture: all
ProcEnviron:
LANGUAGE=
PATH=(custom, user)
LANG=en_US.utf8
SHELL=/bin/zsh
SelectedCard: 0 Intel HDA-Intel - HDA Intel
SourcePackage: alsa-driver
Symptom: audio
Title: [SigmaTel STAC9228] Playback problem
dmi.bios.date: 12/26/2008
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A15
dmi.board.name: 0U8042
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.modalias:
dmi:bvnDellInc.:bvrA15:bd12/26/2008:svnDellInc.:pnXPSM1330:pvr:rvnDellInc.:rn0U8042:rvr:cvnDellInc.:ct8:cvr:
dmi.product.name: XPS M1330
dmi.sys.vendor: Dell Inc.
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