SPDIF output does not work

[idoradai]

i use the right cable (not optic) and no sound. in audio i cant change the output from "default(aml-dummy-codec-analog)" its grey.. and i tryed every option of pass but nothing.. i use OpenELEC for Amlogic 5.0.3 with Kodi 14.1 Helix on MX2

**** List of PLAYBACK Hardware Devices **** card 0: AMLDUMMYCODEC [AML-DUMMY-CODEC], device 0: DUMMY_CODEC PCM dummy_codec-0 [] Subdevices: 1/1 Subdevice #0: subdevice #0