[pulseaudio-tickets] [Bug 65568] New: headphones and non-flat volume (need max-volume lock)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=65568

          Priority: medium
            Bug ID: 65568
                CC: lennart at poettering.net
          Assignee: pulseaudio-bugs at lists.freedesktop.org
           Summary: headphones and non-flat volume (need max-volume lock)
        QA Contact: pulseaudio-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: smikkelsendk at gmail.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: core
           Product: PulseAudio

When using non-flat volumes together with headphones you risk being exposed to
very loud volume.

With flat volumes you can set the master volume such that the maximum volume of
any program will not higher than a bearable volume. Then you adjust the program
volume in the range 80-100 % depending on how loud that given
music-piece/movie-scene is.

However with non-flat volumes the program is not prevented from using the max
possible volume that the soundcard can produce. This means that if the user by
accident makes the volume in the program jump to maximum, then he can risk
having hearing damage.

It can also be due to a bug, ie. a bug in VLC makes it possible for the sound
to suddenly jump to maximum https://trac.videolan.org/vlc/ticket/8583

So my hope is that it will be possible to lock the maximum volume when having
non-flat volume, so that its possible to use headphones without having to fear
hearing damage.

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