How to adjust hdmi audio volume on Android 7.12

[angusshi]

How to adjust hdmi audio volume on Android 7.12? Thanks.

[diegoadrian]

Which i.MX are you using?

Best regards,

Diego

[angusshi]

kernel 4.9.17, i.MX6Q5E, 

[diegoadrian]

Can you please see the audio cards that you have using the command:

$ cat proc/asound/cards

Best Regards,

Diego.