Jetson tx2 audio gain output problem

I used rt5651 to output audio.
However, the audio gain is low, so it is hard to hear.
I tried the following as a way to increase the gain.

  1. rt5651 gain adjustment → max gain setting

    amixer cset -c tegrasndt186ref name=“x DAC1 Playback Volume” 175

    amixer cset -c tegrasndt186ref name=“x HP Playback Volume” 39

    amixer cset -c tegrasndt186ref name=“x OUT Playback Volume” 39

  2. Set master volume control

    amixer -c tegrasndt186ref cset name=“MVC1 Vol” 16000

I tried the above method, but the audio gain is not significantly improved.

Please review how we can improve.

Hi there,

I am afraid I am unable to help with this specific question, but if you don’t mind I will move your topic to the Jetson TX2 experts and I am sure you will receive great support.


Hi Sangjina,

I see that you have set peak gain on codec and MVC side. But confirm if MVC is included in the playback path through below settings

amixer -c tegrasndt186ref cset name="MVC1 Mux" ADMAIF1
amixer -c tegrasndt186ref cset name="I2S1 Mux" MVC1

If you have included MVC in the path, you could do I2S loopback once and check if data signal levels are fine uptil Jetson. Below additional controls/commands will be needed for loopback

amixer -c tegrasndt186ref  cset name="ADMAIF1 Mux" "I2S1"
amixer -c tegrasndt186ref cset name="I2S1 Loopback" "on"
arecord -D hw:tegrasndt186ref,0 -r <rate> -c <channels> -f <sample_format> <out.wav> 

If the data is getting de-amplified inside codec (i.e after getting transmitted from Jetson I2S to codec), you might need to check once with codec vendor as I see that you have set all possible volume related settings on codec side


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