alsactl - advanced controls for ALSA soundcard driver
alsactl [options] [store|restore|init] <card # or id or device>
alsactl is used to control advanced settings for the ALSA soundcard
drivers. It supports multiple soundcards. If your card has features
that you can’t seem to control from a mixer application, you have come
to the right place.
store saves the current driver state for the selected soundcard to the
restore loads driver state for the selected soundcard from the
configuration file. If restoring fails (eventually partly), the init
action is called.
init tries to initialize all devices to a default state. If device is
not known, error code 99 is returned.
If no soundcards are specified, setup for all cards will be saved or
Help: show available flags and commands.
Use debug mode: a bit more verbose.
Print alsactl version number.
Select the configuration file to use. The default is
Used with restore command. Try to restore the matching control
elements as much as possible. This option is set as default
Used with store and restore commands. Do not show ’No soundcards
found’ and do not set an error exit code when soundcards are not
Used with restore command. Don’t restore mismatching control
elements. This option was the old default behavior.
Don’t initialize cards if restore fails. Since version 1.0.18,
alsactl tries to initialize the card with the restore operation
as default. But this can cause incompatibility with the older
version. The caller may expect that the state won’t be touched
if no state file exists. This option takes the restore behavior
back to the older version by suppressing the initialization.
Save restore and init state to this file. The file will contain
only errors. Errors are appended with the soundcard id to the
end of file.
Remove runstate file at first.
-E, --env #=#
Set environment variable (useful for init action or you may
override ALSA_CONFIG_PATH to read different or optimized
configuration - may be useful for "boot" scripts).
-i, --initfile #=#
The configuration file for init. By default,
PREFIX/share/alsa/init/00main is used.
/var/lib/alsa/asound.state (or whatever file you specify with the -f
flag) is used to store current settings for your soundcards. The
settings include all the usual soundcard mixer settings. More
importantly, alsactl is capable of controlling other card-specific
features that mixer apps usually don’t know about.
The configuration file is generated automatically by running alsactl
store. Editing the configuration file by hand may be necessary for some
soundcard features (e.g. enabling/disabling automatic mic gain, digital
output, joystick/game ports, some future MIDI routing options, etc).
amixer(1), alsamixer(1), aplay(1)
alsactl is by Jaroslav Kysela <email@example.com> and Abramo Bagnara
<firstname.lastname@example.org>. This document is by Paul Winkler
15 May 2001