alsamixer - amixer
[UPDATE 20131225 ]
Unmuting the channels
The current version of ALSA installs with all channels muted by default. You will need to unmute the channels manually.
It is easiest to use alsamixer ncurses UI to accomplish this:
$ alsamixer
Alternatively, use amixer from the command-line:
$ amixer sset Master unmute
In alsamixer, the MM label below a channel indicates that the channel is muted, and 00 indicates that it is open.
Scroll to the Master and PCM channels with the ← and → keys and unmute them by pressing the m key. Use the ↑ key to increase the volume and obtain a value of 0 dB gain. The gain can be found in the upper left next to the Item: field. Higher values of gain will produce distorted sound.
$ amixer sset 'Speaker' unmute
$ amixer sset 'Headphone' unmute
1.
tux@slitaz:~$ amixer
Simple mixer control 'Master',0
Capabilities: pvolume pvolume-joined pswitch pswitch-joined penum
Playback channels: Mono
Limits: Playback 0 - 64
Mono: Playback 59 [92%] [-3.75dB] [on]
Simple mixer control 'Headphone',0
Capabilities: pvolume pswitch penum
Playback channels: Front Left - Front Right
Limits: Playback 0 - 64
Mono:
Front Left: Playback 62 [97%] [-1.50dB] [off]
Front Right: Playback 62 [97%] [-1.50dB] [off]
Simple mixer control 'Speaker',0
Capabilities: pvolume pswitch penum
Playback channels: Front Left - Front Right
Limits: Playback 0 - 64
Mono:
Front Left: Playback 61 [95%] [-2.25dB] [off]
Front Right: Playback 61 [95%] [-2.25dB] [off]
[..]
2.
tux@slitaz:~$ amixer sset 'Speaker' unmute
Simple mixer control 'Speaker',0
Capabilities: pvolume pswitch penum
Playback channels: Front Left - Front Right
Limits: Playback 0 - 64
Mono:
Front Left: Playback 62 [97%] [-1.50dB] [on]
Front Right: Playback 62 [97%] [-1.50dB] [on]
3.
tux@slitaz:~$ amixer sset 'Headphone' unmute
Simple mixer control 'Headphone',0
Capabilities: pvolume pswitch penum
Playback channels: Front Left - Front Right
Limits: Playback 0 - 64
Mono:
Front Left: Playback 62 [97%] [-1.50dB] [on]
Front Right: Playback 62 [97%] [-1.50dB] [on]
tux@slitaz:~$
4.
tux@slitaz:~$ amixer scontents
Simple mixer control 'Master',0
Capabilities: pvolume pvolume-joined pswitch pswitch-joined penum
Playback channels: Mono
Limits: Playback 0 - 64
Mono: Playback 49 [77%] [-11.25dB] [on]
Simple mixer control 'Headphone',0
Capabilities: pvolume pswitch penum
Playback channels: Front Left - Front Right
Limits: Playback 0 - 64
Mono:
Front Left: Playback 52 [81%] [-9.00dB] [on]
Front Right: Playback 52 [81%] [-9.00dB] [on]
Simple mixer control 'Speaker',0
Capabilities: pvolume pswitch penum
Playback channels: Front Left - Front Right
Limits: Playback 0 - 64
Mono:
Front Left: Playback 61 [95%] [-2.25dB] [on]
Front Right: Playback 61 [95%] [-2.25dB] [on]
Simple mixer control 'PCM',0
Capabilities: pvolume penum
Playback channels: Front Left - Front Right
Limits: Playback 0 - 255
Mono:
Front Left: Playback 243 [95%] [-2.40dB]
Front Right: Playback 243 [95%] [-2.40dB]
Simple mixer control 'Front Mic',0
Capabilities: cvolume penum
Capture channels: Front Left - Front Right
Limits: Capture 0 - 3
Front Left: Capture 0 [0%] [0.00dB]
Front Right: Capture 0 [0%] [0.00dB]
Simple mixer control 'Front Mic Jack Mode',0
Capabilities: enum
Items: 'Mic In' 'Line In'
Item0: 'Mic In'
Simple mixer control 'Line',0
Capabilities: cvolume penum
Capture channels: Front Left - Front Right
Limits: Capture 0 - 3
Front Left: Capture 0 [0%] [0.00dB]
Front Right: Capture 0 [0%] [0.00dB]
Simple mixer control 'IEC958',0
Capabilities: pswitch pswitch-joined penum
Playback channels: Mono
Mono: Playback [off]
Simple mixer control 'IEC958 Default PCM',0
Capabilities: pswitch pswitch-joined penum
Playback channels: Mono
Mono: Playback [on]
Simple mixer control 'IEC958 Playback Source',0
Capabilities: enum
Items: 'Digital Playback' 'Off'
Item0: 'Digital Playback'
Simple mixer control 'IEC958 Playback Source',1
Capabilities: enum
Items: 'Digital Playback' 'Off'
Item0: 'Digital Playback'
Simple mixer control 'Aux',0
Capabilities: cvolume penum
Capture channels: Front Left - Front Right
Limits: Capture 0 - 3
Front Left: Capture 0 [0%] [0.00dB]
Front Right: Capture 0 [0%] [0.00dB]
Simple mixer control 'Capture',0
Capabilities: cvolume cswitch penum
Capture channels: Front Left - Front Right
Limits: Capture 0 - 15
Front Left: Capture 0 [0%] [0.00dB] [off]
Front Right: Capture 0 [0%] [0.00dB] [off]
Simple mixer control 'Capture',1
Capabilities: cvolume cswitch penum
Capture channels: Front Left - Front Right
Limits: Capture 0 - 15
Front Left: Capture 0 [0%] [0.00dB] [off]
Front Right: Capture 0 [0%] [0.00dB] [off]
Simple mixer control 'Input Source',0
Capabilities: cenum
Items: 'Front Mic' 'Rear Mic' 'Line' 'Aux'
Item0: 'Front Mic'
Simple mixer control 'Input Source',1
Capabilities: cenum
Items: 'Front Mic' 'Rear Mic' 'Line' 'Aux'
Item0: 'Front Mic'
Simple mixer control 'Rear Mic',0
Capabilities: cvolume penum
Capture channels: Front Left - Front Right
Limits: Capture 0 - 3
Front Left: Capture 0 [0%] [0.00dB]
Front Right: Capture 0 [0%] [0.00dB]
Simple mixer control 'Rear Mic Jack Mode',0
Capabilities: enum
Items: 'Mic In' 'Line In'
Item0: 'Mic In'
tux@slitaz:~$
