Hardware: Linkit Smart 7688 + Breakout v2.0 + Speaker 8 Ohm
Firmware: v0.9.4
Software: madplay / alsa
No sound on the speakers. Headphones sound is ok (checked by madplay / aplay).
No reaction after changing “Headphone Playback ZC” and “Speaker Playback ZC” alsamixer settings. I can change headphone volume by “Headphone [bB]” setting.
amixer
Simple mixer control ‘Headphone’,0
Capabilities: pvolume
Playback channels: Front Left - Front Right
Limits: Playback 0 - 127
Mono:
Front Left: Playback 120 [94%] [-1.00dB]
Front Right: Playback 120 [94%] [-1.00dB]
Simple mixer control ‘Headphone Playback ZC’,0
Capabilities: pswitch
Playback channels: Front Left - Front Right
Mono:
Front Left: Playback [on]
Front Right: Playback [on]
Simple mixer control ‘Speaker’,0
Capabilities: pvolume
Playback channels: Front Left - Front Right
Limits: Playback 0 - 127
Mono:
Front Left: Playback 127 [100%] [6.00dB]
Front Right: Playback 127 [100%] [6.00dB]
Simple mixer control ‘Speaker AC’,0
Capabilities: volume volume-joined
Playback channels: Mono
Capture channels: Mono
Limits: 0 - 5
Mono: 5 [100%]
Simple mixer control ‘Speaker DC’,0
Capabilities: volume volume-joined
Playback channels: Mono
Capture channels: Mono
Limits: 0 - 5
Mono: 5 [100%]
Simple mixer control ‘Speaker Playback ZC’,0
Capabilities: pswitch
Playback channels: Front Left - Front Right
Mono:
Front Left: Playback [on]
Front Right: Playback [on]
Simple mixer control ‘PCM Playback -6dB’,0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [off]
Simple mixer control ‘Mono Output Mixer Left’,0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [off]
Simple mixer control ‘Mono Output Mixer Right’,0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [off]
Simple mixer control ‘Playback’,0
Capabilities: volume
Playback channels: Front Left - Front Right
Capture channels: Front Left - Front Right
Limits: 0 - 255
Front Left: 255 [100%] [0.50dB]
Front Right: 255 [100%] [0.50dB]
Simple mixer control ‘Capture’,0
Capabilities: cvolume cswitch
Capture channels: Front Left - Front Right
Limits: Capture 0 - 63
Front Left: Capture 43 [68%] [-75.50dB] [off]
Front Right: Capture 43 [68%] [-75.50dB] [off]
Simple mixer control ‘3D’,0
Capabilities: volume volume-joined pswitch pswitch-joined
Playback channels: Mono
Capture channels: Mono
Limits: 0 - 15
Mono: 0 [0%] Playback [off]
Simple mixer control ‘3D Filter Lower Cut-Off’,0
Capabilities: enum
Items: ‘Low’ ‘High’
Item0: ‘Low’
Simple mixer control ‘3D Filter Upper Cut-Off’,0
Capabilities: enum
Items: ‘High’ ‘Low’
Item0: ‘High’
Simple mixer control ‘ADC High Pass Filter’,0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [off]
Simple mixer control ‘ADC PCM’,0
Capabilities: cvolume
Capture channels: Front Left - Front Right
Limits: Capture 0 - 255
Front Left: Capture 206 [81%] [6.00dB]
Front Right: Capture 206 [81%] [6.00dB]
Simple mixer control ‘ADC Polarity’,0
Capabilities: enum
Items: ‘No Inversion’ ‘Left Inverted’ ‘Right Inverted’ ‘Stereo Inversion’
Item0: ‘No Inversion’
Simple mixer control ‘ALC Attack’,0
Capabilities: volume volume-joined
Playback channels: Mono
Capture channels: Mono
Limits: 0 - 15
Mono: 2 [13%]
Simple mixer control ‘ALC Decay’,0
Capabilities: volume volume-joined
Playback channels: Mono
Capture channels: Mono
Limits: 0 - 15
Mono: 3 [20%]
Simple mixer control ‘ALC Function’,0
Capabilities: enum
Items: ‘Off’ ‘Right’ ‘Left’ ‘Stereo’
Item0: ‘Off’
Simple mixer control ‘ALC Hold Time’,0
Capabilities: volume volume-joined
Playback channels: Mono
Capture channels: Mono
Limits: 0 - 15
Mono: 0 [0%]
Simple mixer control ‘ALC Max Gain’,0
Capabilities: volume volume-joined
Playback channels: Mono
Capture channels: Mono
Limits: 0 - 7
Mono: 7 [100%]
Simple mixer control ‘ALC Min Gain’,0
Capabilities: volume volume-joined
Playback channels: Mono
Capture channels: Mono
Limits: 0 - 7
Mono: 0 [0%]
Simple mixer control ‘ALC Mode’,0
Capabilities: enum
Items: ‘ALC’ ‘Limiter’
Item0: ‘ALC’
Simple mixer control ‘ALC Target’,0
Capabilities: volume volume-joined
Playback channels: Mono
Capture channels: Mono
Limits: 0 - 15
Mono: 4 [27%]
Simple mixer control ‘DAC Deemphasis’,0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [off]
Simple mixer control ‘DAC Polarity’,0
Capabilities: enum
Items: ‘No Inversion’ ‘Left Inverted’ ‘Right Inverted’ ‘Stereo Inversion’
Item0: ‘No Inversion’
Simple mixer control ‘Left Boost Mixer LINPUT1’,0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [on]
Simple mixer control ‘Left Boost Mixer LINPUT2’,0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [on]
Simple mixer control ‘Left Boost Mixer LINPUT3’,0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [off]
Simple mixer control ‘Left Input Boost Mixer LINPUT2’,0
Capabilities: volume volume-joined
Playback channels: Mono
Capture channels: Mono
Limits: 0 - 7
Mono: 0 [0%] [-99999.99dB]
Simple mixer control ‘Left Input Boost Mixer LINPUT3’,0
Capabilities: volume volume-joined
Playback channels: Mono
Capture channels: Mono
Limits: 0 - 7
Mono: 0 [0%] [-99999.99dB]
Simple mixer control ‘Left Input Mixer Boost’,0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [on]
Simple mixer control ‘Left Output Mixer Boost Bypass’,0
Capabilities: volume volume-joined pswitch pswitch-joined
Playback channels: Mono
Capture channels: Mono
Limits: 0 - 7
Mono: 2 [29%] [-15.00dB] Playback [off]
Simple mixer control ‘Left Output Mixer LINPUT3’,0
Capabilities: volume volume-joined pswitch pswitch-joined
Playback channels: Mono
Capture channels: Mono
Limits: 0 - 7
Mono: 7 [100%] [0.00dB] Playback [off]
Simple mixer control ‘Left Output Mixer PCM’,0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [on]
Simple mixer control ‘Noise Gate’,0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [off]
Simple mixer control ‘Noise Gate Threshold’,0
Capabilities: volume volume-joined
Playback channels: Mono
Capture channels: Mono
Limits: 0 - 31
Mono: 0 [0%]
Simple mixer control ‘Right Boost Mixer RINPUT1’,0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [on]
Simple mixer control ‘Right Boost Mixer RINPUT2’,0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [on]
Simple mixer control ‘Right Boost Mixer RINPUT3’,0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [off]
Simple mixer control ‘Right Input Boost Mixer RINPUT2’,0
Capabilities: volume volume-joined
Playback channels: Mono
Capture channels: Mono
Limits: 0 - 7
Mono: 0 [0%] [-99999.99dB]
Simple mixer control ‘Right Input Boost Mixer RINPUT3’,0
Capabilities: volume volume-joined
Playback channels: Mono
Capture channels: Mono
Limits: 0 - 7
Mono: 0 [0%] [-99999.99dB]
Simple mixer control ‘Right Input Mixer Boost’,0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [on]
Simple mixer control ‘Right Output Mixer Boost Bypass’,0
Capabilities: volume volume-joined pswitch pswitch-joined
Playback channels: Mono
Capture channels: Mono
Limits: 0 - 7
Mono: 2 [29%] [-15.00dB] Playback [off]
Simple mixer control ‘Right Output Mixer PCM’,0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [on]
Simple mixer control ‘Right Output Mixer RINPUT3’,0
Capabilities: volume volume-joined pswitch pswitch-joined
Playback channels: Mono
Capture channels: Mono
Limits: 0 - 7
Mono: 7 [100%] [0.00dB] Playback [off]
Dear customer,
it is a bug of firmware 0.9.4. please use the 0.9.3 from <LINK_TEXT text=“https://docs.labs.mediatek.com/resource … /downloads”>https://docs.labs.mediatek.com/resource/linkit-smart-7688/zh_cn/downloads</LINK_TEXT>. thanks.
Seeed techsupport team
Bill
Firmware was changed to 0.9.3, but still no sound on speakers. Should I change any settings?
Dear Costomer:
Could you please take some photos about the hardware connection and send me a screenshot ?