alsactl man page on ElementaryOS

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ALSACTL(1)							    ALSACTL(1)

NAME
       alsactl - advanced controls for ALSA soundcard driver

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.

       -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 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.

       -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 set‐
       tings include all the usual  soundcard  mixer  settings.	  More	impor‐
       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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