alsactl



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


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 configu-
       ration 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).

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


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.


       -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 config-
              uration - may be useful for "boot" scripts).


       -i, --initfile
              The   configuration   file   for   init.   By   default,    PRE-
              FIX/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.


       tantly,  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>.



                                  05 Apr 2013                       ALSACTL(1)
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