kmix (with pulseaudio) main channel affects other channels as well. also there is no way to control channels directly anymore

Bug #659546 reported by Mr.Chainsaw on 2010-10-12
This bug affects 5 people
Affects Status Importance Assigned to Milestone
kdemultimedia (Ubuntu)

Bug Description

Binary package hint: kdemultimedia

In Kubuntu 10.10/KDE SC 4.5 kmix works differently than before when one uses pulseaudio. As said, the main channel affects other channels as well. The buggy thing is, that once affected, the other channels do not remember their old settings. That is a problem with 5.1 upmix, because one want different channels to have different volumes. So after using masterchannel they are all the same volume

The second point that bothers me is, that you can not control the other channels/speakers anymore. So one has to do this with alsamixer, but than accidently changed main channel with kmix everything is lost.

In 10.04 pulseaudio wasn't standard, but i needed it for the upmix function to get 5.1 sound with the creative x-fi card. Though that was no problem because kmix worked fine.

I know that this “Bug” comes with KDE 4.5 because i tested it once with 10.04 and had the same problem.

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: kmix 4:4.5.1-0ubuntu1
ProcVersionSignature: Ubuntu 2.6.35-22.33-generic
Uname: Linux 2.6.35-22-generic x86_64
Architecture: amd64
Date: Tue Oct 12 23:50:04 2010
ExecutablePath: /usr/bin/kmix
InstallationMedia: Kubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
SourcePackage: kdemultimedia
XsessionErrors: (process:1741): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed

Mr.Chainsaw (mr.chainsaw) wrote :
description: updated
Braden Obrzut (blzut3) wrote :

I'm having the same problem. KMix only shows "SB Live! EMU10k1 Analog Stereo" which I assume is the master channel. Alsamixer does allow me to configure the individual channels, however I need to do this every time I restart the computer. In particular this in inconvenient since I need to be able to constantly adjust my optical audio channels.

I had the same problem before on Lucid, when I tried the updates from the kubuntu-ppa repositories, which gave the 4.7 version of qt. I tried this repeatedly and always rolled back because of this problem.

Now with Maverick there's nowhere to roll back to, but luckily there just might be a solution to this.

Mr.Chainsaw (mr.chainsaw) wrote :

Thank you, with this workaround you get the old behaviour. But if the new behaviour is intended by design, than there is still the bug with the main channel affecting the volumes of other channels.
I could live with setting up the speaker volumes once and than just use the master channel for volume adjustments. Thats what I have done before. But every time you use the master, it fucks up your speaker settings ... :/

ronny (ronny-standtke) wrote :

I have to join in here...
I have a 5.1 surround system and need to have different volume levels for Front, Surround and Center. There seems to be no way of configuring this with KMix. Setting the different volumes with alsamixer works but as soon as you change the volume with KMix all settings are lost. Do KMix developers think that everybody only has stereo equipment?!

Launchpad Janitor (janitor) wrote :

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

Changed in kdemultimedia (Ubuntu):
status: New → Confirmed
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