Rock64 No Audio - Solved

[pytheas]

Google Translate :
I tried that way with "xenial-minimal-rock64-0.6.22-188-armhf" and "xenial-minimal-rock64-0.6.22-188-arm64", but I did not hear any sound. why?


その方法を"xenial-minimal-rock64-0.6.22-188-armhf"と"xenial-minimal-rock64-0.6.22-188-arm64"で試しましたが、音が出ませんでした。何故?

I've good results following wbecks's solution (debian stretch mate 9.3, 4.4.112-rockchip-ayufan-189).
Here is my list of packages relating to alsa (I don't know which or if any is necessary)
alsa-utils
libao-common
libao4
libasound2
libasound2-data
libasound2-dev
libasound2-plugins
libmatemixer0
libmatemixer-common
libopenal1
pulseaudio

I use VLC 2.2.7.1 to play sound files, setting Audio/audio device to I2S Analog stereo
The output is strong enough to drive a true Sennheiser headset (4 - 400 ohms)
Hope that helps...