Sound distortion appears at volume ~75%

[Andrew Grabko]

After update from Natty to Oneiric some sound distortions began to appear if sound volume is higher then ~75%. Although I don't have a very good ear of music and my sound speakers are old and cheap, so maybe these distortions appear at volumes less than 75% too. Also I'm not pretty sure whether it is exactly pulseaudio issue, however I've tested it on several players (Banshee and VLC) and got the same result, so it's definitly not an application specific issue.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: pulseaudio 1:1.0-0ubuntu3
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
NonfreeKernelModules: nvidia
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 1.23-0ubuntu3
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: VT1828S Analog [VT1828S Analog]
   Subdevices: 2/2
   Subdevice #0: subdevice #0
   Subdevice #1: subdevice #1
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: revan 3853 F.... pulseaudio
 /dev/snd/controlC0: revan 3853 F.... pulseaudio
 /dev/snd/pcmC0D0p: revan 3853 F...m pulseaudio
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xf3ff8000 irq 46'
   Mixer name : 'VIA VT1828S'
   Components : 'HDA:11064441,104383cf,00100100'
   Controls : 38
   Simple ctrls : 22
Card1.Amixer.info:
 Card hw:1 'NVidia'/'HDA NVidia at 0xf7cfc000 irq 17'
   Mixer name : 'Nvidia GPU 12 HDMI/DP'
   Components : 'HDA:10de0012,10de0101,00100100'
   Controls : 16
   Simple ctrls : 4
CheckboxSubmission: 0d4fdf04c454b502aef513e05b53cc1f
CheckboxSystem: edda5d4f616ca792bf437989cb597002
Date: Sat Oct 15 20:21:23 2011
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: pulseaudio
UpgradeStatus: Upgraded to oneiric on 2011-10-13 (1 days ago)
dmi.bios.date: 07/23/2010
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1807
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: P7P55D PRO
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1807:bd07/23/2010:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP7P55DPRO:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer

[Daniel T Chen (crimsun)]

Using Sound Preferences, does the volume appear beyond the Unamplified
region?

[Andrew Grabko (andrew-grabko)]

Yes, when volume is at Unamplified mark it is about 60% volume level in sound indicator, so 75% volume is beyond this mark.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.