Linkit Smart 7688 no sound on the speakers

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 ?