kodi@mediacenter:~$ grep eld_valid /proc/asound/NVidia/eld*
/proc/asound/NVidia/eld#0.0:eld_valid           0
/proc/asound/NVidia/eld#0.1:eld_valid           1
/proc/asound/NVidia/eld#0.2:eld_valid           0

kodi@mediacenter:~$ aplay -l | grep NVidia
Karte 1: NVidia [HDA NVidia], Gerät 3: HDMI 0 [HDMI 0]
Karte 1: NVidia [HDA NVidia], Gerät 7: HDMI 1 [HDMI 1]
Karte 1: NVidia [HDA NVidia], Gerät 8: HDMI 2 [HDMI 2]

speaker-test -D plughw:1,7 -c2