I’m on OpenSuse Tumbleweed (although I’m pretty sure I noticed the behavior on Manjaro, too).
The problem is that the volume of e.g. Firefox gets turned down for no reason. I noticed that a youtube video was quite quiet. I then checkt pavu control and saw that the volume for Firefox was set to 83%. I set it back to 100, but after the pc resumed from standby, it was at 83 again. Sometimes it’s enough to just pause the video for it to move the volume back down.
Why is that and how do I disable this functionality?
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The first thing that came to mind after reading the title was, “uninstall PulseAudio”.
Jokes aside, it could be some setting of the DE you are using. If the audio output device is detected as headphones, there tend to be settings that reduce the master volume on certain events.
I remember KDE Plasma used to do that. Every time I switched the output device (or was it when I unplugged and re-plugged it?), it set the headphone volume to 60%.I’ve never seen this “just” happen, but have seen it during events like switching from headphones to speakers and such.
You may also have your app volumes linked to your master channels, meaning when you lower the sound on your master with something like a key combo, then it lowers the individual app volumes as well, which is generally not something you’d want enabled.
Apps at full, and using PCM/Master channel for general volume is pretty much the “default”.