alsactl.1

ALSA驱动的一些调试测试工具

.TH ALSACTL 1 "15 May 2001"
.SH NAME
alsactl \- advanced controls for ALSA soundcard driver

.SH SYNOPSIS

\fBalsactl\fP [\fIoptions\fP] [\fIstore\fP|\fIrestore\fP|\fIinit\fP] <card # or id or device>

.SH DESCRIPTION
\fBalsactl\fP 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.

.SH COMMANDS

\fIstore\fP saves the current driver state for the selected soundcard
to the configuration file.

\fIrestore\fP loads driver state for the selected soundcard from the
configuration file. If restoring fails (eventually partly), the init
action is called.

\fIinit\fP tries to initialize all devices to a default state. If device
is not known, error code 99 is returned.

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

.SH OPTIONS

.TP
\fI\-h, \-\-help\fP 
Help: show available flags and commands.

.TP
\fI\-d, \-\-debug\fP
Use debug mode: a bit more verbose.

.TP
\fI\-v, \-\-version\fP
Print alsactl version number.

.TP
\fI\-f, \-\-file\fP
Select the configuration file to use. The default is /etc/asound.state.

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

.TP
\fI\-g, \-\-ignore\fP
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.

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

.TP
\fI\-I, \-\-no\-init\-fallback\fP
Don't initialize cards if restore fails.  Since version 1.0.18,
\fBalsactl\fP 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.

.TP
\fI\-r, \-\-runstate\fP
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.

.TP
\fI\-R, \-\-remove\fP
Remove runstate file at first.

.TP
\fI\-E, \-\-env\fP #=#
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).

.TP
\fI\-i, \-\-initfile\fP #=#
The configuration file for init. By default, PREFIX/share/alsa/init/00main
is used.

.SH FILES
\fI/etc/asound.state\fP (or whatever file you specify with the
\fB\-f\fP 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
\fBalsactl store\fP. 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).

.SH SEE ALSO
\fB
amixer(1),
alsamixer(1),
aplay(1)
\fP

.SH BUGS 
None known.

.SH AUTHOR
\fBalsactl\fP is by Jaroslav Kysela <[e-mail]> and Abramo Bagnara
<abramo@alsa\-project.org>. This document is by Paul Winkler <[e-mail]>.