> If pulseaudio ignore dB scale, do this mean it use full volume range ?
> Do PCM Playback volume remain at 0dB all the time ? Yes, it then uses the complete Master range, indicated as: -46.50 dB (0 %) to 0 dB (100%). PCM stays at 0 dB (56 %) while doing so. > do distortion occur when your application play to alsa device hw:0,0 directly when PCM playback volume is over 0dB ? Using alsa directly with PCM above 0db gave distortions as before. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to pulseaudio in Ubuntu. https://bugs.launchpad.net/bugs/1311525 Title: Can only use half the sound range without overdriving sound Status in “pulseaudio” package in Ubuntu: New 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://lists.freedesktop.org/archives/pulseaudio-discuss/2012-April/013249.html http://www.freedesktop.org/wiki/Software/PulseAudio/Documentation/User/PulseAudioStoleMyVolumes/ "If you are experiencing distortions/clipping even though the inner volumes are set to 0dB, then this means that the dB information your ALSA driver exports is simply incorrect. In this case please file a bug against your audio driver and ask them to correct (i.e. shift up) the volume scale of that volume control." ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: alsa-base 1.0.25+dfsg-0ubuntu4 ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9 Uname: Linux 3.13.0-24-generic i686 ApportVersion: 2.14.1-0ubuntu3 Architecture: i386 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: alad 2110 F.... pulseaudio /dev/snd/pcmC0D0p: alad 2110 F...m pulseaudio /dev/snd/controlC1: alad 2110 F.... pulseaudio 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) PackageArchitecture: all 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.asset.tag: 123456789000 dmi.chassis.type: 3 dmi.chassis.vendor: Chassis Manufacture dmi.chassis.version: Chassis Version dmi.modalias: dmi:bvnPhoenixTechnologies,LTD:bvrASUSA8N-SLIPremiumACPIBIOSRevision1303:bd08/10/2006:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnA8N-SLIPremium:rvr1.02:cvnChassisManufacture:ct3:cvrChassisVersion: dmi.product.name: System Product Name dmi.product.version: System Version dmi.sys.vendor: System manufacturer mtime.conffile..etc.modprobe.d.alsa.base.conf: 2014-04-23T01:09:11.857997 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1311525/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
