Comment # 21 on bug 1177169 from Zlatko Michailov

Set the dtoverlay as suggested. Rebooted.

1) Yast > Hardware > Sound
Still nothing shows up

2) aplay -L
null
    Discard all samples (playback) or generate zero samples (capture)
sysdefault
    Default Audio Device
iec958
    IEC958 (S/PDIF) Digital Audio Output
speexrate
    Rate Converter Plugin Using Speex Resampler
pulse
    PulseAudio Sound Server
upmix
    Plugin for channel upmix (4,6,8)
default
    Default ALSA Output (currently PulseAudio Sound Server)
sysdefault:CARD=vc4hdmi0
    vc4-hdmi-0, MAI PCM vc4-hdmi-hifi-0
    Default Audio Device
front:CARD=vc4hdmi0,DEV=0
    vc4-hdmi-0, MAI PCM vc4-hdmi-hifi-0
    Front output / input
iec958:CARD=vc4hdmi0,DEV=0
    vc4-hdmi-0, MAI PCM vc4-hdmi-hifi-0
    IEC958 (S/PDIF) Digital Audio Output
sysdefault:CARD=vc4hdmi1
    vc4-hdmi-1, MAI PCM vc4-hdmi-hifi-0
    Default Audio Device
front:CARD=vc4hdmi1,DEV=0
    vc4-hdmi-1, MAI PCM vc4-hdmi-hifi-0
    Front output / input
iec958:CARD=vc4hdmi1,DEV=0
    vc4-hdmi-1, MAI PCM vc4-hdmi-hifi-0
    IEC958 (S/PDIF) Digital Audio Output

3) aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: vc4hdmi0 [vc4-hdmi-0], device 0: MAI PCM vc4-hdmi-hifi-0 [MAI PCM
vc4-hdmi-hifi-0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: vc4hdmi1 [vc4-hdmi-1], device 0: MAI PCM vc4-hdmi-hifi-0 [MAI PCM
vc4-hdmi-hifi-0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0