[kde] [Bug 380857] New: Respect playback device output on systems with pulseaudio (flat-volumes = yes)

[Leonard Lausen]

https://bugs.kde.org/show_bug.cgi?id=380857

            Bug ID: 380857
           Summary: Respect playback device output on systems with
                    pulseaudio (flat-volumes = yes)
           Product: kde
           Version: unspecified
          Platform: Gentoo Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: leonard at lausen.nl
  Target Milestone: ---

flat-volumes, which is enabled by default in PulseAudio (though many
distributions disable it) scales the device-volume with the volume of the
"loudest" application. Applications, unaware of this feature, can set their
volume to 100% at startup, potentially blowing the speakers or ears of the
user.

Unfortunately KDE applications do exactly that, which is not only a health
hazard for users but also relatively hard to debug for users unfamiliar with
PulseAudio.

KDE Applications should therefore at startup never set their output volume to
100%, but simply to the volume of the playback device to which they are
outputting.

I noticed this behaviour in particular with the error messages generated by
Dolphin and Okular, but it probably affects more applications.

Related bugs are #346614, #352312, #352176 and #327723

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