Provided by: alsa-utils_1.0.14-1ubuntu4_i386 bug
 

NAME

        amixer - command-line mixer for ALSA soundcard driver
 

SYNOPSIS

        amixer [-option] [cmd]
 

DESCRIPTION

        amixer  allows command-line control of the mixer for the ALSA soundcard
        driver.  amixer supports multiple soundcards.
 
        amixer with no arguments will display the current  mixer  settings  for
        the  default  soundcard and device. This is a good way to see a list of
        the simple mixer controls you can use.
 

COMMANDS

        help   Shows syntax.
 
        info   Shows the information about a mixer device.
 
        scontrols
               Shows a complete list of simple mixer controls.
 
        scontents
               Shows a complete list of simple mixer controls with  their  con‐
               tents.
 
        set or sset <SCONTROL> <PARAMETER> ...
               Sets the simple mixer control contents. The parameter can be the
               volume either as a percentage from 0% to 100% with %  suffix,  a
               dB  gain  with  dB  suffix  (like -12.5dB), or an exact hardware
               value.  The dB gain can be used only for the mixer elements with
               available  dB  information.   When plus(+) or minus(-) letter is
               appended after volume value, the volume is incremented or decre‐
               mented from the current value, respectively.
 
               The  parameters  cap,  nocap,  mute,  unmute, toggle are used to
               change capture (recording) and muting for the group specified.
 
               The optional modifiers can be put as extra parameters to specify
               the  stream direction or channels to apply.  The modifiers play‐
               back and capture specify the stream, and  the  modifiers  front,
               rear, center, woofer are used to specify channels to be changed.
 
               A simple mixer control must be specified. Only one device can be
               controlled at a time.
 
        get or sget <SCONTROL>
               Shows the simple mixer control contents.
 
               A simple mixer control must be specified. Only one device can be
               controlled at a time.
 
        controls
               Shows a complete list of card controls.
 
        contents
               Shows a complete list of card controls with their contents.
 
        cset <CONTROL> <PARAMETER> ...
               Sets the card control contents. The identifier has these  compo‐
               nents:  iface,  name,  index, device, subdevice, numid. The next
               argument specifies the value of control.
 
        cget <CONTROL>
               Shows the card control contents. The identifier has same  syntax
               as for the cset command.
 

OPTIONS

        -c card
 
               Select  the card number to control. The device name created from
               this parameter has syntax ’hw:N’ where N is specified card  num‐
               ber.
 
        -D device
 
               Select  the  device name to control. The default control name is
               ’default’.
 
        -s | --stdin
 
               Read from stdin and execute the command  on  each  line  sequen‐
               tially.   When this option is given, the command in command-line
               arguments is ignored.
 
               Only sset and cset are accepted.  Other  commands  are  ignored.
               The commands to unmatched ids are ignored without errors too.
 
        -h     Help: show syntax.
 
        -q     Quiet mode. Do not show results of changes.
 

EXAMPLES

        amixer -c 1 sset Line,0 80%,40% unmute cap
               will  set  the  second soundcard’s left line input volume to 80%
               and right line input to 40%, unmute  it,  and  select  it  as  a
               source for capture (recording).
 
        amixer -c 1 -- sset Master playback -20dB
               will  set the master volume of the second card to -20dB.  If the
               master has multiple channels, all channels are set to  the  same
               value.
 
        amixer -c 1 set PCM 2dB+
               will  increase the PCM volume of the second card with 2dB.  When
               both playback and capture volumes exist, this is applied to both
               volumes.
 
        amixer -c 2 cset iface=MIXER,name=     Line Playback Volume",index=1 40%
               will set the third soundcard’s second line playback volume(s) to
               40%
 
        amixer -c 2 cset numid=34 40%
               will set the 34th soundcard element to 40%
 

BUGS

        None known.
 

AUTHOR

        amixer is by Jaroslav Kysela <perex@suse.cz>.  This document is by Paul
        Winkler <zarmzarm@erols.com> and Jaroslav Kysela <perex@suse.cz>.
 
                                   11 Aug 2000                        AMIXER(1)