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nixos/pulseaudio: disable flat-volumes by default

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The motivation for this is that some applications are unaware
of this feature and can set their volume to 100% on startup
harming people ears and possiblly blowing someone's audio
setup.

I noticed this in #54594 and by extension epiphany[0].

Please also note that many other distros have this default for
the reason outlined above.

Closes #5632 #54594

[0]: https://bugzilla.gnome.org/show_bug.cgi?id=675217
This commit is contained in:
worldofpeace 2019-01-27 14:24:12 -05:00
parent 022c0165c2
commit dc923b6ad1
2 changed files with 18 additions and 1 deletions
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14
nixos/doc/manual/release-notes/rl-1903.xml
View file

@ -423,6 +423,20 @@
use <literal>nixos-rebuild boot; reboot</literal>.
</para>
</listitem>
<listitem>
<para>
Flat volumes are now disabled by default in <literal>hardware.pulseaudio</literal>.
This has been done to prevent applications, which are unaware of this feature, setting
their volumes to 100% on startup causing harm to your audio hardware and potentially your ears.
</para>
<note>
<para>
With this change application specific volumes are relative to the master volume which can be
adjusted independently, whereas before they were absolute; meaning that in effect, it scaled the
device-volume with the volume of the loudest application.
</para>
</note>
</listitem>
</itemizedlist>
</section>
</section>

5
nixos/modules/config/pulseaudio.nix
View file

@ -180,7 +180,7 @@ in {
type = types.attrsOf types.unspecified;
default = {};
description = ''Config of the pulse daemon. See <literal>man pulse-daemon.conf</literal>.'';
example = literalExample ''{ flat-volumes = "no"; }'';
example = literalExample ''{ realtime-scheduling = "yes"; }'';
};
};
@ -242,6 +242,9 @@ in {
source = writeText "libao.conf" "default_driver=pulse"; }
];
# Disable flat volumes to enable relative ones
hardware.pulseaudio.daemon.config.flat-volumes = mkDefault "no";
# Allow PulseAudio to get realtime priority using rtkit.
security.rtkit.enable = true;