amixer - command-line mixer for ALSA soundcard driver


   amixer [-option] [cmd]


   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.


   help   Shows syntax.

   info   Shows the information about a mixer device.

          Shows a complete list of simple mixer controls.

          Shows a complete  list  of  simple  mixer  controls  with  their

   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
          decremented 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
          playback and capture  specify  the  stream,  and  the  modifiers
          front,  rear,  center, woofer are used to specify channels to be

          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.

          Shows a complete list of card controls.

          Shows a complete list of card controls with their contents.

   cset <CONTROL> <PARAMETER> ...
          Sets  the  card  control  contents.  The  identifier  has  these
          components:  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.


   -c card

          Select  the card number to control. The device name created from
          this parameter has syntax  'hw:N'  where  N  is  specified  card

   -D device

          Select  the  device name to control. The default control name is

   -s | --stdin

          Read  from  stdin  and  execute  the  command   on   each   line
          sequentially.   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.

   -R     Use  the raw value for evaluating the percentage representation.
          This is the default mode.

   -M     Use  the   mapped   volume   for   evaluating   the   percentage
          representation like alsamixer, to be more natural for human ear.


   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

   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

   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

   amixer -c 2 cset numid=34 40%
          will set the 34th soundcard element to 40%




   None known.


   amixer is by Jaroslav Kysela <>.   This  document  is  by
   Paul Winkler <> and Jaroslav Kysela <>.

                              11 Aug 2000                        AMIXER(1)


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