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For the plug-and-play hardware, like USB devices, it may be helpful to manage the sound state periodically, before the devices are removed. This change implements new commands 'daemon' and 'rdaemon' to save the sound state in defined intervals when the sound controls are changed. The udev rules can notify the daemon using the 'kill' or 'nrestore' commands to rescan available cards in the system. Signed-off-by: Jaroslav Kysela <perex@perex.cz>
145 lines
4.1 KiB
Groff
145 lines
4.1 KiB
Groff
.TH ALSACTL 1 "05 Apr 2013"
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.SH NAME
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alsactl \- advanced controls for ALSA soundcard driver
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.SH SYNOPSIS
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\fBalsactl\fP [\fIoptions\fP] [\fIstore\fP|\fIrestore\fP|\fIinit\fP] <card # or id or device>
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.SH DESCRIPTION
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\fBalsactl\fP is used to control advanced settings for the ALSA
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soundcard drivers. It supports multiple soundcards. If your card has
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features that you can't seem to control from a mixer application,
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you have come to the right place.
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.SH COMMANDS
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\fIstore\fP saves the current driver state for the selected soundcard
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to the configuration file.
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\fIrestore\fP loads driver state for the selected soundcard from the
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configuration file. If restoring fails (eventually partly), the init
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action is called.
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\fInrestore\fP is like \fIrestore\fP, but it notifies also the daemon
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to do new rescan for available soundcards.
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\fIinit\fP tries to initialize all devices to a default state. If device
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is not known, error code 99 is returned.
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\fIdaemon\fP manages to save periodically the sound state.
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\fIrdaemon\fP like \fIdaemon\fP but restore the sound state at first.
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\fIkill\fP notifies the daemon to do the specified operation (quit,
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rescan, save_and_quit).
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If no soundcards are specified, setup for all cards will be saved or
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loaded.
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.SH OPTIONS
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.TP
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\fI\-h, \-\-help\fP
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Help: show available flags and commands.
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.TP
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\fI\-d, \-\-debug\fP
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Use debug mode: a bit more verbose.
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.TP
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\fI\-v, \-\-version\fP
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Print alsactl version number.
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.TP
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\fI\-f, \-\-file\fP
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Select the configuration file to use. The default is /var/lib/alsa/asound.state.
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.TP
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\fI\-F, \-\-force\fP
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Used with restore command. Try to restore the matching control elements
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as much as possible. This option is set as default now.
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.TP
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\fI\-g, \-\-ignore\fP
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Used with store and restore commands. Do not show 'No soundcards found'
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and do not set an error exit code when soundcards are not installed.
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.TP
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\fI\-P, \-\-pedantic\fP
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Used with restore command. Don't restore mismatching control elements.
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This option was the old default behavior.
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.TP
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\fI\-I, \-\-no\-init\-fallback\fP
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Don't initialize cards if restore fails. Since version 1.0.18,
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\fBalsactl\fP tries to initialize the card with the restore operation
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as default. But this can cause incompatibility with the older version.
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The caller may expect that the state won't be touched if no state file
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exists. This option takes the restore behavior back to the older
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version by suppressing the initialization.
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.TP
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\fI\-r, \-\-runstate\fP
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Save restore and init state to this file. The file will contain only errors.
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Errors are appended with the soundcard id to the end of file.
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.TP
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\fI\-R, \-\-remove\fP
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Remove runstate file at first.
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.TP
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\fI\-E, \-\-env\fP #=#
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Set environment variable (useful for init action or you may override
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ALSA_CONFIG_PATH to read different or optimized configuration - may be
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useful for "boot" scripts).
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.TP
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\fI\-i, \-\-initfile\fP
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The configuration file for init. By default, PREFIX/share/alsa/init/00main
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is used.
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.TP
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\fI\-p, \-\-period\fP
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The store period in seconds for the daemon command.
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.TP
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\fI\-e, \-\-pid-file\fP
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The pathname to store the process-id file in the HDB UUCP format (ASCII).
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.TP
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\fI\-b, \-\-background\fP
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Run the task in background.
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.TP
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\fI\-s, \-\-syslog\fP
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Use syslog for messages.
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.SH FILES
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\fI/var/lib/alsa/asound.state\fP (or whatever file you specify with the
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\fB\-f\fP flag) is used to store current settings for your
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soundcards. The settings include all the usual soundcard mixer
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settings. More importantly, alsactl is
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capable of controlling other card-specific features that mixer apps
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usually don't know about.
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The configuration file is generated automatically by running
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\fBalsactl store\fP. Editing the configuration file by hand may be
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necessary for some soundcard features (e.g. enabling/disabling
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automatic mic gain, digital output, joystick/game ports, some future MIDI
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routing options, etc).
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.SH SEE ALSO
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\fB
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amixer(1),
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alsamixer(1),
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aplay(1),
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alsactl_init(7)
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\fP
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.SH BUGS
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None known.
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.SH AUTHOR
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\fBalsactl\fP is by Jaroslav Kysela <perex@perex.cz> and Abramo Bagnara
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<abramo@alsa\-project.org>. This document is by Paul Winkler <zarmzarm@erols.com>.
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