NVIDIA driver not exposing interface

[dschlic1]

I have a Dell M6700 notebook computer with a NVIDIA K5000M graphics card. This graphics card also has a HDMI port for connecting audio and video to home theater systems. When I connect it to my home system, Windows 7 Pro sees and is able to use all 7.1 channels of my home theater system. However it looks like the NVIDIA driver does not have ASIO "hooks" to that same 7.1 audio channels. I used enum4ks to check the interface and here is the result:
A4AInfo v1.0 (c)2003-2005, Michael Tippach

============================
Start WDM Device Enumeration
============================

---------------------- 8< ----------------------
Device Path: HDAUDIO\FUNC_01&VEN_10DE&DEV_0040&SUBSYS_1028053F&REV_1001
Device BUS NUMBER = 00000000
NVIDIA High Definition Audio / NVIDIA / NVHDA.sys
Instance ID: 00000800
+NVIDIA High Definition Audio
NumPins: 00000002

---------------------- 8< ----------------------
Device Path: HDAUDIO\FUNC_01&VEN_111D&DEV_76DF&SUBSYS_1028053F&REV_1002
Device BUS NUMBER = 00000000
IDT High Definition Audio CODEC / IDT / STHDA.sys
Instance ID: 000008A0
+HpOut
NumPins: 00000002
+MicIn2
NumPins: 00000002
+MuxedIn
NumPins: 00000002
+Speaker/HP
NumPins: 00000002

============================
Exit WDM Device Enumeration
============================

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As you can see the only exposed channels appear to be the headphones. Can someone verify if this is correct?