alsamixer - IEC958 Playback Source [AC-Link] или [A/D Converter]

имею интегрированную звуковуху VIA8237

arvdr:/usr/src/XBMC# aplay -L
default:CARD=V8237
VIA 8237, VIA 8237
Default Audio Device
front:CARD=V8237,DEV=0
VIA 8237, VIA 8237
Front speakers
surround40:CARD=V8237,DEV=0
VIA 8237, VIA 8237
4.0 Surround output to Front and Rear speakers
surround41:CARD=V8237,DEV=0
VIA 8237, VIA 8237
4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=V8237,DEV=0
VIA 8237, VIA 8237
5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=V8237,DEV=0
VIA 8237, VIA 8237
5.1 Surround output to Front, Center, Rear and Subwoofer speakers
iec958:CARD=V8237,DEV=0
VIA 8237, VIA 8237
IEC958 (S/PDIF) Digital Audio Output
null
Discard all samples (playback) or generate zero samples (capture)
arvdr:/usr/src/

и пытаюсь настроить spdif выход на ней дял многоканального звука. Вижу, что в alsamixer есть 2 опции

IEC958 Playback Source [A/D Converter]
и
IEC958 Playback Source [AC-Link]

какую из них выбрать, чтобы нормально заработал многоканальный звук на spdif ? Пока никак не получается вывести DD через spdif и xine

в xine конфиге прописано

# device used for mono output
# string, default: default
audio.device.alsa_default_device:iec958:CARD=V8237,DEV=0

# device used for stereo output
# string, default: plug:front:default
audio.device.alsa_front_device:iec958:CARD=V8237,DEV=0

# alsa mixer device
# string, default: PCM
#audio.device.alsa_mixer_name:PCM

# sound card can do mmap
# bool, default: 0
#audio.device.alsa_mmap_enable:0

# device used for 5.1-channel output
# string, default: iec958:AES0=0x6,AES1=0x82,AES2=0x0,AES3=0x2
audio.device.alsa_passthrough_device:iec958:CARD=V8237,DEV=0

# device used for 4-channel output
# string, default: plug:surround40:0
audio.device.alsa_surround40_device:plug:surround40:iec958:CARD=V8237,DEV=0

# device used for 5.1-channel output
# string, default: plug:surround51:0
audio.device.alsa_surround51_device:plug:surround51:iec958:CARD=V8237,DEV=0

# speaker arrangement
# { Mono 1.0 Stereo 2.0 Headphones 2.0 Stereo 2.1 Surround 3.0 Surround 4.0 Surround 4.1 Surround 5.0 Surround
audio.output.speaker_arrangement:Pass Through

# offset for digital passthrough
# numeric, default: 0
#audio.synchronization.passthrough_offset:0

# play audio even on slow/fast speeds
# bool, default: 0
#audio.synchronization.slow_fast_audio:0

# method to sync audio and video
# { metronom feedback resample }, default: 0
#audio.synchronization.av_sync_method:metronom feedback