Comment 54 for bug 871808

Rene Arts (renearts) wrote :

I again altered some stuff: I prefer to use the hardware master channel to control volume instead of the PCM (software, meh) channel. Maybe the strange crackling stuff is over now as well as I'm not altering the PCM level anymore :)
I changed /usr/share/pulseaudio/alsa-mixer/paths/analog-output.conf.common to be:

[Element Master]
switch = mute
volume = merge

[Element PCM]
switch = mute
volume = ignore
override-map.1 = all
override-map.2 = all-left,all-right

[Element LFE]
switch = mute
volume = ignore

I think this file overrides the earlier modifications in /usr/share/pulseaudio/alsa-mixer/paths/analog-output.conf ?
It works fine now anyway :D