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Date:      Fri, 08 Nov 2024 15:46:39 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 144659] [pcm] The distortion of the sound playback of music at high volume levels.
Message-ID:  <bug-144659-227-tMx2Gjjpcz@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-144659-227@https.bugs.freebsd.org/bugzilla/>
References:  <bug-144659-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D144659

spell@itl.ua changed:

           What    |Removed                     |Added
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                 CC|                            |spell@itl.ua

--- Comment #8 from spell@itl.ua ---
(In reply to Christos Margiolis from comment #7)

> Is this issue still reproducible with current versions of FreeBSD?

I can approve that yes, it is on 13.2-RELEASE.

How to reproduce:

(Initially mixer vol =3D 100; hw.snd.vpc_0db=3D45)
1) Run as user: mplayer sometrack.mp3 (hearing clean sound)
2) Run as root: sysctl hw.snd.vpc_0db=3D4; mixer 70 (hearing distorted soun=
d with
roughly the same sound level)
3) Run as root: sysctl hw.snd.vpc_0db=3D45; mixer 100 (hearing again clean =
sound)

The sort of distortion is as of some poor sound and seems this is due to po=
or
algorithm calculating sound level amplification according to hw.snd.vpc_0db
value.

BTW, when rising/lowing sound level only by mixer or by mplayer interactive
knobs, the sound remains clean.

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