No sound connecting Qosmio G30 via HDMI to audio/video receiver

When I connect my Qosmio G30-177 via HDMI cable to my audio/video receiver using Windows Vista Ultimate I get no sound but excellent video.
When I connect the DVD recorder to the receiver (also via HDMI-cable) the sound is o.k.
Do I have to use the s/pdif interface instead of HDMI to transmit the sound to the receiver or is it also possible via HDMI?
Sound driver:
Sigma tel high definition audio codec
15.12.2006
6.10.5324.0

Hi
Im not a audio expert but in my knowledge the HDMI transmit the audio and video signals.
The HDMI 1.0 and 1.1 support Dolby DigitalDTS audio format
The HDMI 1.2 supports Dolby DigitalDTS and DVD-Audio format
The HDMI 1.3 supports Dolby DigitalDTS, DVD-Audio and SACD audio formats.
All HDMI standards support a Typ A (19pol) jacks

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No sound connecting Qosmio G30 via HDMI to audio/video receiver

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