Audio 3.5mm Jack not working

[LMM]

Hi,

Sorry for the late answer, I didn't get notification by email.

Code:

# amixer set 'Right Headphone Mixer Right DAC' on
amixer: Unable to find simple control 'Right Headphone Mixer Right DAC',0

I have no idea how to adjust parameters.

If I understood properly, I can use

Code:

# amixer scontrols
# amixer scontents

to list the devices, but it doesn't return anything.

Code:

# amixer info
Card default 'HDMI'/'HDMI'
 Mixer name : ''
 Components : ''
 Controls      : 3
 Simple ctrls  : 0

for me, amixer returns :

Code:

Card default 'rockchiprk3399'/'rockchip,rk3399'
 Mixer name : ''
 Components : ''
 Controls      : 35
 Simple ctrls  : 35

It seems that you are using hdmi output, therefore you have to switch the card.
You can probably use alsamixer command or

Code:

amixer -c 0 set Headphone playback 100% unmute

0 should be rockship sound card