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SOLVED:
by adeding ipc_perm 0666 to asound.conf dmix device



OSMC not picking up hifiberry sound device.
I disabled HDMI and on board audio, bt OSMC is still showing them.
Can not select hifiberry as audio device.

which alsa device is OSMC using? 
in my asound I have as default the dmix plug .


any idea?

I also discovered the mpd is not able to use dmix alsa device with a permission error but can use hw sound device. Not sure if this is related



I have aplay l 
**** List of PLAYBACK Hardware Devices ****
card 2: sndrpihifiberry [snd_rpi_hifiberry_digi], device 0: HifiBerry Digi HiFi wm8804-spdif-0
  Subdevices: 1/1
  Subdevice #0: subdevice #0

aplay -L
hifiberry-hw
dmixer-hifiberry
default
sysdefault:CARD=sndrpihifiberry
    snd_rpi_hifiberry_digi, 
    Default Audio Device
iec958:CARD=sndrpihifiberry,DEV=0
    snd_rpi_hifiberry_digi, 
    IEC958 (S/PDIF) Digital Audio Output
dmix:CARD=sndrpihifiberry,DEV=0
    snd_rpi_hifiberry_digi, 
    Direct sample mixing device
dsnoop:CARD=sndrpihifiberry,DEV=0
    snd_rpi_hifiberry_digi, 
    Direct sample snooping device
hw:CARD=sndrpihifiberry,DEV=0
    snd_rpi_hifiberry_digi, 
    Direct hardware device without any conversions
plughw:CARD=sndrpihifiberry,DEV=0
    snd_rpi_hifiberry_digi, 
    Hardware device with all software conversions