From 98a62ccab6ac30d13c2dbcdc7468af8f87df4ec9 Mon Sep 17 00:00:00 2001 From: Christos Margiolis Date: Fri, 17 Apr 2026 17:47:44 +0200 Subject: [PATCH] pcm.4: Document dev.pcm.%d.eq* Sponsored by: The FreeBSD Foundation MFC after: 1 week Pull Request: https://ron-dev.freebsd.org/FreeBSD/src/pulls/15 --- share/man/man4/pcm.4 | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/share/man/man4/pcm.4 b/share/man/man4/pcm.4 index 3f228d703b1..b0f944a0d44 100644 --- a/share/man/man4/pcm.4 +++ b/share/man/man4/pcm.4 @@ -430,6 +430,17 @@ the definitive format/rate target. The recommended way to use bitperfect mode is to disable VCHANs and enable this sysctl. Default is disabled. +.It Va dev.pcm.%d.eq +Set to 1 or 0 to enable (1) or disable (0) the equalizer. +Default is disabled. +When enabled, the mixer bass and treble controls can be used, as well as the +.Va dev.pcm.%d.eq_preamp +tunable. +.It Va dev.pcm.%d.eq_preamp +Equalizer preamp (in dB). +.Va dev.pcm.%d.eq +has to be enabled, in order for this tunable to take effect. +Read the tunable's description to see the available range of values. .It Va dev.pcm.%d.[play|rec].vchans Enable (1) or disable (0) VCHANs. Default is enabled.