[Stanislav]

Yes it works, except that audio out changed to HDA Intel again (this also happened a few days ago). I changed it back to USB DAC and it is fine now.

So now my .config/openbox/autostart looks like this:

OUTPUT=`xrandr -display :0 -q | sed '/ connected/!d;s/ .*//;q'`
xrandr -display :0 --output $OUTPUT --set "Broadcast RGB" "Full"
xrandr -display :0 --output $OUTPUT --set "Broadcast RGB" "Video 16:235 pass-through"
xsetroot #000000
xset -dpms
devmon &
AE_SINK=alsa MALLOC_MMAP_THRESHOLD_=131072 /usr/bin/kodi --standalone
  while [ $? -ne 0 ]; do
  AE_SINK=alsa MALLOC_MMAP_THRESHOLD_=131072 /usr/bin/kodi --standalone
done
openbox --exit