No sound over hdmi, ION2 system

Hi there
I'm trying to get sound output over hdmi connection without any success. I'm totally out of ideas as I tried it with openelec.tv and a xbmc live system. All the time I never heard anything. I tested with speaker-test and mplayer. I tried stuff from the guide here: http://breden.org.uk/2010/09/30/shuttle … ta-2-live/, http://www.nvnews.net/vbulletin/showthread.php?t=157347 and also from xbmc wiki:
-different settings of asound.conf (however afaik this does not affect speaker-test -D plughw:X,Y -cN)
-options for the snd-hda-intel module
-unmuting
-different input channels of my receiver
-different nvidia driver versions
Here are my specs:
[card: (II) NVIDIA(0): NVIDIA GPU ION (GT218) at PCI:1:0:0 (GPU-0)
NVIDIA Driver Version: 260.19.29
kernel: 2.6.36-ARCH
alsa: 1.0.23
Onkyo TX-SR508 receiver using hdmi 1.4 cable
aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
Subdevices: 0/1
Subdevice #0: subdevice #0
card 1: NVidia [HDA NVidia], device 3: NVIDIA HDMI [NVIDIA HDMI]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: NVidia [HDA NVidia], device 7: NVIDIA HDMI [NVIDIA HDMI]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: NVidia [HDA NVidia], device 8: NVIDIA HDMI [NVIDIA HDMI]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: NVidia [HDA NVidia], device 9: NVIDIA HDMI [NVIDIA HDMI]
Subdevices: 1/1
Subdevice #0: subdevice #0
What I noticed is that dmesg does not show any hdmi hotplug event, something like: "HDMI hot plug event: Pin=5 Presence_Detect=1 ELD_Valid=0"
So I thought maybe you arch linux people have some creative ideas what the problem is here?
PS: It can't be the hardware because it works with windows7.

.:B:. wrote:Does audio over HDMI work when the nvidia module isn't loaded? The 1st gen AppleTV has that issue, but I cannot imagine nVidia's ION platforms suffering from the same problem on Linux...
No, does not work either... I need to help to figure out why the hotplugging and detecting of the receiver does not even work.

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