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.
- scontrols
- Shows a complete list of simple mixer controls.
- scontents
- Shows a complete list of simple mixer controls with their
contents.
-
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 before the value to
specify the stream direction or channels to apply. The modifiers
playback and capture specify the stream, and the modifiers
front, frontleft, frontright, frontcenter, center, rear,
rearright, rearleft, 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
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.
- sevents
- Shows the events for the simple mixer controls.
- events
- Shows the events for the mixer controls.
-
-c card
-
Select the card number to control. The device name created from this
parameter has syntax 'hw:N' where N is specified card number.
-
-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 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 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%
alsamixer(1)
None known.
amixer is by Jaroslav Kysela <
[email protected]>. This document is by
Paul Winkler <
[email protected]> and Jaroslav Kysela
<
[email protected]>.