Can only use half the sound range without overdriving sound
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
pulseaudio (Ubuntu) |
Confirmed
|
Undecided
|
Unassigned |
Bug Description
On a Nvidia CK804 (Asus A8N SLI Premium), the audio can only be set to "base" (63 %) without overdriving the sound. This is because 0db (100 %) is reported wrong in pulseaudio; when seen in alsamixer it actually sets PCM to 12db, causing distortions.
According to PulseAudio this is a bug in the alsa driver
http://
http://
"If you are experiencing distortions/
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: alsa-base 1.0.25+
ProcVersionSign
Uname: Linux 3.13.0-24-generic i686
ApportVersion: 2.14.1-0ubuntu3
Architecture: i386
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/
/dev/snd/pcmC0D0p: alad 2110 F...m pulseaudio
/dev/snd/
CurrentDesktop: XFCE
Date: Wed Apr 23 10:18:29 2014
InstallationDate: Installed on 2014-04-20 (2 days ago)
InstallationMedia: Xubuntu 14.04 LTS "Trusty Tahr" - Release i386 (20140416.2)
PackageArchitec
SourcePackage: alsa-driver
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/10/2006
dmi.bios.vendor: Phoenix Technologies, LTD
dmi.bios.version: ASUS A8N-SLI Premium ACPI BIOS Revision 1303
dmi.board.name: A8N-SLI Premium
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: 1.02
dmi.chassis.
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.
dmi.modalias: dmi:bvnPhoenixT
dmi.product.name: System Product Name
dmi.product.
dmi.sys.vendor: System manufacturer
mtime.conffile.
take a look at alc850 datasheet or Intel AC97 2.x specificatiom
6.3.5 Analog Mixer Input Gain Registers (Index 0Ch - 18h)
all mixer inputs have +12dB gain (e.g. phone, Mic, line in, CD, Video, Auxiliary and PCM OUT)