Advantech RSB-3720 User Manual page 45

 Audio test
 Check audio codec
# cat /proc/asound/cards
0 [sgtl5000
1 [audiohdmi
 Audio codec(sgtl5000):
 Set MIC and headphone
# amixer set Mic 32%
Simple mixer control 'Mic',0
Capabilities: volume volume-joined
Playback channels: Mono
Capture channels: Mono
Limits: 0 - 3
Mono: 1 [33%] [20.00dB]
#amixer set Lineout 100%
Simple mixer control 'Lineout',0
Capabilities: pvolume
Playback channels: Front Left - Front Right
Limits: Playback 0 - 31
Mono:
Front Left: Playback 31 [100%] [0.00dB]
Front Right: Playback 31 [100%] [0.00dB]
amixer set PCM 100%
Simple mixer control 'PCM',0
Capabilities: pvolume
Playback channels: Front Left - Front Right
Limits: Playback 0 - 192
Mono:
Front Left: Playback 192 [100%]
Front Right: Playback 192 [100%]
]: sgtl5000 - sgtl5000
sgtl5000
]: audio-hdmi - audio-hdmi
audio-hdmi