Red Hat Bugzilla – Bug 135842
Loud noise caused by kmix default setup (alsa, ensoniq audiopci)
Last modified: 2007-11-30 17:10:51 EST
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Description of problem:
starting up in KDE once enabling alsa for the system you discover a
HUGE quantity of white-noise coming from the speaker systems. It isn't
immediately apparent what the cause is, and the only way to adjust the
issue in KDE is using KDE's sound/volume control preferences (kmix),
hitting the Advanced button, and muting the IEC958 control checkbox.
I don't offhand know what this particular control is for, and have
little interest in digging further considering the amount of noise
generated by it unmuted, but would like to recommend that the default
setting be muted for users launching KDE for the first time, with this
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. install the below mentioned card
2. install FC2
3. boot system and log into X, instructing GDM to start KDE for the
Actual Results: LOUD white-noise emanates from the speaker, requiring
the disabling of IEC958 under the advanced button in the kde sound
preferences (kmix , part of kdemultimedia-3.2.2-2 )
Expected Results: quiet, normal system volume
00:0b.0 Multimedia audio controller: Ensoniq 5880 AudioPCI (rev 02)
the actual card is a Creative Labs SoundBlaster PCI 128
The system itself here was upgraded from FC1 to FC2, and after
initially resolving the problems with /dev/snd/* needing to be
represented in /etc/security/console.perms under the <sound> macro so
that running alsamixer (and figuring out how to use that) or
gnome-volume-control or kmix would allow me to configure the system
volumes as a *user*, I had thought the issue resolved until one of my
users logged in (his setup defaults to KDE -- I use blackbox myself
and others on this system use gnome).
alsa drivers start muted in general. If it's starting with volume,
either a) someone saved the volume in that state, or b) some other app
is unmuting it.
If it's only happening in KDE, assigning to kdemultimedia.
I get this bug with my soundcard on my secondary machine. It has an
Ensoniq 5880 AudioPCI card. Disabling IEC958 fixes the problem for me
Note, the static occurs regardless of the volume setting. We all know
at this point that KDE resets volume to zero upon startup anyway.
Could you please try reproducing on fc3 or rawhide? I suspect this was fixed
upstream some time ago. (And yes, it is kmix's fault, i have hit that before).
no longer a factor on FC5. not sure exactly which release of alsa-utils
resolved it, but I've marked it with the current release.