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 configuration file.
restore loads driver state for the selected soundcard from the configuration file. If
restoring fails (eventually partly), the init action is called.
nrestore is like restore, but it notifies also the daemon to do new rescan for available
init tries to initialize all devices to a default state. If device is not known, error
code 99 is returned.
daemon manages to save periodically the sound state.
rdaemon like daemon but restore the sound state at first.
kill notifies the daemon to do the specified operation (quit, rescan, save_and_quit).
If no soundcards are specified, setup for all cards will be saved or loaded.
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 /var/lib/alsa/asound.state.
Used with restore command. Try to restore the matching control elements as much as
possible. This option is set as default now.
Used with store and restore commands. Do not show 'No soundcards found' and do not
set an error exit code when soundcards are not installed.
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_CON-
FIG_PATH to read different or optimized configuration - may be useful for "boot"
The configuration file for init. By default, PREFIX/share/alsa/init/00main is used.
The store period in seconds for the daemon command.
The pathname to store the process-id file in the HDB UUCP format (ASCII).
Run the task in background.
Use syslog for messages.
Set the process priority (see 'man nice')
Set the process scheduling policy to idle (SCHED_IDLE).
/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_init(7)
alsactl is by Jaroslav Kysela <email@example.com> and Abramo Bagnara
<firstname.lastname@example.org>. This document is by Paul Winkler <email@example.com>.
05 Apr 2013 ALSACTL(1)