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Orange Pi Zero audio output only could in Mono mode?

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Published in 2016-12-3 19:08:04 | Show all floors |Read mode
Hi,All,

I tried 2 systems, one is oringinal debian from orange pi team, one is Armbian, after installation, I check it with amixer, found the sound card only could works on mono mode. detail please see below,  Does there have some mistake? or H2+ chip could support mono mode for audio output?

root@orangepizero:~# amixer
Simple mixer control 'Lineout volume control',0
  Capabilities: volume volume-joined
  Playback channels: Mono
  Capture channels: Mono
  Limits: 0 - 31
  Mono: 31 [100%]
Simple mixer control 'ADC input gain ctrl',0
  Capabilities: volume volume-joined
  Playback channels: Mono
  Capture channels: Mono
  Limits: 0 - 7
  Mono: 0 [0%]
Simple mixer control 'Audio adda drc',0
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [off]
Simple mixer control 'Audio adda loop',0
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [on]
Simple mixer control 'Audio linein in',0
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [off]
Simple mixer control 'Audio lineout',0
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [on]
Simple mixer control 'LINEIN_G boost stage output mixer control',0
  Capabilities: volume volume-joined
  Playback channels: Mono
  Capture channels: Mono
  Limits: 0 - 7
  Mono: 0 [0%]
Simple mixer control 'MIC1 boost AMP gain control',0
  Capabilities: volume volume-joined
  Playback channels: Mono
  Capture channels: Mono
  Limits: 0 - 7
  Mono: 0 [0%]
Simple mixer control 'MIC1_G boost stage output mixer control',0
  Capabilities: volume volume-joined
  Playback channels: Mono
  Capture channels: Mono
  Limits: 0 - 7
  Mono: 0 [0%]
Simple mixer control 'MIC2 boost AMP gain control',0
  Capabilities: volume volume-joined
  Playback channels: Mono
  Capture channels: Mono
  Limits: 0 - 7
  Mono: 0 [0%]
Simple mixer control 'MIC2_G boost stage output mixer control',0
  Capabilities: volume volume-joined
  Playback channels: Mono
  Capture channels: Mono
  Limits: 0 - 7
  Mono: 0 [0%]
Simple mixer control 'audio capture mode',0
  Capabilities: enum
  Items: 'main mic' 'mic1_2' 'linein'
  Item0: 'main mic'


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 Author| Published in 2016-12-3 20:53:51 | Show all floors
Just checked the board circuit diagram, there is no connection for I2S, I checked the Pin PA20, it is NC, so the board  can not used for audio, specially if you want to use I2S interface.

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