alsactl

ALSACTL(1)                  General Commands Manual                 ALSACTL(1)



NAME
       alsactl - advanced controls for ALSA soundcard driver


SYNOPSIS
       alsactl [options] [store|restore|init] <card # or id or device>

       alsactl monitor <card # or id>


DESCRIPTION
       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.


COMMANDS
       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 soundcards.

       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).

       monitor is for monitoring the events received from the given control
       device.

       If no soundcards are specified, setup for all cards will be saved,
       loaded or monitored.


OPTIONS
       -h, --help
              Help: show available flags and commands.


       -d, --debug
              Use debug mode: a bit more verbose.


       -v, --version
              Print alsactl version number.


       -f, --file
              Select the configuration file to use. The default is
              /var/lib/alsa/asound.state.


       -l, --lock
              Use the file locking to serialize the concurrent access to the
              state file (this option is default for the global state file).


       -L, --no-lock
              Do not use the file locking to serialize the concurrent access
              to the state file (including the global state file).


       -O, --lock-state-file
              Select the state lock file path.


       -F, --force
              Used with restore command.  Try to restore the matching control
              elements as much as possible.  This option is set as default
              now.


       -g, --ignore
              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.


       -P, --pedantic
              Used with restore command.  Don't restore mismatching control
              elements.  This option was the old default behavior.


       -I, --no-init-fallback
              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.


       -r, --runstate
              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.


       -R, --remove
              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.


       -p, --period
              The store period in seconds for the daemon command.


       -e, --pid-file
              The pathname to store the process-id file in the HDB UUCP format
              (ASCII).


       -b, --background
              Run the task in background.


       -s, --syslog
              Use syslog for messages.


       -n, --nice
              Set the process priority (see 'man nice')


       -c, --sched-idle
              Set the process scheduling policy to idle (SCHED_IDLE).


FILES
       /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).


SEE ALSO
        amixer(1), alsamixer(1), aplay(1), alsactl_init(7)


BUGS
       None known.


AUTHOR
       alsactl is by Jaroslav Kysela <perex@perex.cz> and Abramo Bagnara
       <abramo@alsa-project.org>. This document is by Paul Winkler
       <zarmzarm@erols.com>.



                                  07 May 2014                       ALSACTL(1)