AES parameter ignored unless using iecset?

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 Hi,

I'm trying to get hdmi digital pass through sound working. I've got it
working by using iecset first, this works:

saruman ~ # iecset -c0 -n1 audio false
Mode: consumer
Data: non-audio
Rate: 44100 Hz
Copyright: permitted
Emphasis: none
Category: general
Original: 1st generation
Clock: 1000 ppm
saruman ~ # iecset -c0 -n1 -x
AES0=0x06,AES1=0x00,AES2=0x00,AES3=0x00
saruman ~ # aplay -D hdmi:CARD=Intel,DEV=0 SURROUNDTEST_DD_640.wav

However, I need to be able to set to use audio mode with some content
and not others (for mythtv). So next I tried to pass the AES flag to
aplay which I believe should set the audio mode:
saruman ~ # iecset -c0 -n1 audio true
Mode: consumer
Data: audio
Rate: 44100 Hz
Copyright: permitted
Emphasis: none
Category: general
Original: 1st generation
Clock: 1000 ppm
saruman ~ # iecset -c0 -n1 -x
AES0=0x04,AES1=0x00,AES2=0x00,AES3=0x00
saruman ~ # aplay -D
hdmi:CARD=Intel,DEV=0,AES0=0x06,AES1=0x00,AES2=0x00,AES3=0x00
SURROUNDTEST_DD_640.wav

however this doesn't seem to override the current AES0=0x04 settings!

I'm running on ALSA 1.0.23 with a HDA-Intel card - full details of my
system setup (generated by alsa-info.sh) are here:
http://www.alsa-project.org/db/?f=8f0f4cd6e869b602ee37f70a3d64c9aa6b6ccffe

How do I override the AES0 flag? Any help is appreciated!

Thanks
Steve

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