Bug 604303

Summary: KDE pulseaudio integration: volume level sync is very strange
Product: [Fedora] Fedora Reporter: Viktor Erdelyi <verdelyi>
Component: pulseaudioAssignee: Lennart Poettering <lpoetter>
Status: CLOSED NOTABUG QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: low    
Version: 13CC: lkundrak, lpoetter
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OS: Linux   
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Last Closed: 2010-06-29 21:32:43 UTC Type: ---
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Description Viktor Erdelyi 2010-06-15 19:54:32 UTC
Pulseaudio volumes are not even close to be in sync with the alsamixer levels. After experimenting for a while I managed to max out the pulseaudio master channel (internal audio analog stereo) in kmix while alsamixer's master (on HDA Intel, not the pulseaudio device) was only at 10/100.

Another strange thing is that when I move an application-specific slider, the master level changes as well. There is some connection between the levels (when I move a slider in kmix/"pulse", some alsa levels change) however I have no idea about the nature of that connection.

Version-Release number of selected component (if applicable):
pulseaudio-0.9.21-6.fc13.i686
KDE 4.4.3

HW is Realtek ALC882 HD audio.

PS: volume levels were strange on Gnome as well (especialy when trying to adjust 5.1 levels separately), but not to this extent.

Comment 1 Lennart Poettering 2010-06-29 21:32:43 UTC
Yes, PA unifies the dB scale across all sound cards. This is a feature, not a bug:

http://pulseaudio.org/wiki/PulseAudioStoleMyVolumes
http://pulseaudio.org/wiki/WritingVolumeControlUIs

Comment 2 Viktor Erdelyi 2010-06-30 21:34:26 UTC
I was talking about KMix's controls and KDE integration, not PA itself. Having KMix's "PA Master" (and all other controls of KMix) maxed out while there is almost no sound, is _imho_ not a feature but a bug. Feel free to disagree, however.