Hello. I still have this problem in Ubuntu 13.04. The sound fails all the time, and the only way to fix it is to manually change the sound controls in the sound panel. By changing balance and volume, it comes back. As soon as I increase or decrease the volume again, it goes bad again. The only way to prevent this is to only change volume in the hardware.
Please note: I don't have any problems when using stereo headphones. -- 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/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: Triaged 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 To manage notifications about this bug go to: https://bugs.launchpad.net/pulseaudio/+bug/445849/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp