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[Rolf Leggewie <445849@xxxxxxxxxxxxxxxxxx>]

lucid has seen the end of its life and is no longer receiving any
updates. Marking the lucid task for this ticket as "Won't Fix".

** Changed in: pulseaudio (Ubuntu Lucid)
       Status: Triaged => Won't Fix

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https://bugs.launchpad.net/bugs/445849

Title:
  Highpitched rattling like sound with 5.1 surround configuration

Status in PulseAudio sound server:
  Invalid
Status in pulseaudio package in Ubuntu:
  Fix Released
Status in pulseaudio source package in Lucid:
  Won't Fix
Status in pulseaudio source package in Maverick:
  Fix Released

Bug description:
  SRU justification:
  Pulseaudio contains volume scaling code optimized for the MMX and SSE instruction sets on X86, and optimized volume scaling code for some ARM CPU variants. This code initially did not deal with unusual numbers of channels, 3, 5, 6 and 7 on x86 using the SSE instruction set, and 3 on X86 using the MMX instruction set, and ARM. This resulted in various odd sounds, such as indicated in the original bug report below, and other comments in this report. This SRU fixes the code to correctly deal with the above number of channels, 6 channels being common for 5.1 audio output. Thanks to David Henningsson for the patch.

  Regression potential:
  There is a very low chance of this regressing other parts of PulseAudio. The patch in question only touches the optimized code source files in the source tree, so the chance of this affecting other users detrimentally is extremely unlikely.

  This fix is in the above linked pulseaudio natty branch, ready for
  upload once natty is open for general development.

  Original bug report follows:

  Binary package hint: pulseaudio

  I'm hearing a high pitched rattling sound when I have pulseaudio set to 5.1 surround
  I set PulseAudio to 5.1 surround via the PulseAudio Volume Manager under the Configuration Tab
  I'm running the Karmic Koala beta with all the newest Updates
  I have a 82801JI (ICH10 Family) HD Audio Controller

  I've tried other settings under the Configuration Tab, Analog Stereo
  seems to work perfectly but I have a 5.1 Surround Speaker Setup.

  This problem seems to get worse as I increase the volume through
  pulseaudio, if I change the volume of a individual channel it gets
  almost impossible to listen to anything, all I can hear is a high
  pitched rattling like sound. However if I set the volume of channels
  individually through 'alsamixer' it doesn't screw up at all.

  ProblemType: Bug
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  chris      2096 F.... pulseaudio
   /dev/snd/pcmC0D0c:   chris      2096 F...m pulseaudio
   /dev/snd/pcmC0D0p:   chris      2096 F...m pulseaudio
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xf9ff8000 irq 22'
     Mixer name	: 'Realtek ALC1200'
     Components	: 'HDA:10ec0888,104382fe,00100101'
     Controls      : 40
     Simple ctrls  : 22
  Date: Wed Oct  7 18:01:59 2009
  DistroRelease: Ubuntu 9.10
  NonfreeKernelModules: nvidia
  Package: pulseaudio 1:0.9.18-0ubuntu3
  ProcEnviron:
   PATH=(custom, user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: pulseaudio
  Uname: Linux 2.6.31-pae i686

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