ALSA

Troubleshooting audio problems

symptom:
- no audio in some applications.
- pulseaudio only shows a dummy audio output channel.

$ pulseaudio -k
$ pulseaudio -D
E: [pulseaudio] main.c: Daemon startup failed.

Check if there is any application blocking the output sound card:

$ fuser -v /dev/snd/pcm*
                     USER        PID ACCESS COMMAND
/dev/snd/pcmC0D0c:   overshoot   4454 F...m Application
/dev/snd/pcmC2D0c:   overshoot  12878 F...m pulseaudio

Quit or kill that application and try again.

media-plugins/alsaequal

Homepage: http://www.thedigitalmachine.net/alsaequal.html
Description: a real-time adjustable equalizer plugin for ALSA

media-plugins/alsaequal-0.6-r2 from gentoo has been broken for a few years.
media-plugins/alsaequal-0.6-r3 from the following overlay works:
https://github.com/dimibyte/gentoo-overlay

Usage

Place the following code in ~/.asoundrc for a single user, or within /etc/asound.conf:
pcm.!default {
type hw
card 0
}

ctl.!default {
type hw
card 0
}

ctl.equal {
type equal;

Firefox: ALSA and Pulseaudio

http://linux.overshoot.tv/www-client/firefox
USE=-pulseaudio : audio will not play without pulseaudio installed

ALSA support removed

In Firefox release 52, Mozilla disabled ALSA support by default and made Firefox default to Pulseaudio.

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