Rock64 Can Not Find Sound Card

[idiotdream]

I install archlinux on Rock64 -4G, then can not find sound card
# aplay -l
aplay: device_list:272: no soundcards found...
#lsmod | grep snd
snd_soc_hdmi_codec 20480 0
snd_soc_rockchip_spdif 16384 0
# alsamixer
cannot open mixer: no such file or directory

I do not kown what is wrong, or how to get sound out either from hdmi or 3.5mm

[her01n]

You need to add your user to audio group:
$this->bbcode_second_pass_code('', '
# gpasswd -a username audio
')
Then exit the shell and re-login.
See https://wiki.archlinux.org/index.php/Advanced_Linux_Sound_Architecture#Installation

[samanthgates29]

Creating a bug report/issue
Required Information
DietPi version | 6.21.1
Distro version | stretch
Kernel version | Linux DietPi 4.4.77-rockchip-ayufan-136
SBC device | Rock64 (aarch64)
Power supply used | 5V 1A
SDcard used | SanDisk ultra
Steps to reproduce
Update dietpi using: sudo dietpi-update
Try to play some sound
Expected behaviour
Hear sounds

Actual behaviour
Can't hear anything

Extra details
Log says:
Feb 08 20:03 : exception: Failed to open "DietPi Alsa" [alsa]
Feb 08 20:03 : exception: nested: Failed to open ALSA device "default": Permission denied

So I try to change sound card permissions and works !
sudo chmod -R a+rw /dev/snd
But after next update, the problem appears again.
spankbang