Audio over displayport (Nvidia M6500)

I'll add more info now (though I was hoping that someone from Dell would've replied by now)...

I uninstalled and removed all nvidia drivers and executables from my system, and thenI reverted all the way back to the driver that was included on the DVD shipped with my M6500 last year some time... the installer package driver version off the DVD was 8.16.11.8843.  Also, I removed the IDT drivers and obbserved that a "Microsoft High Definition Audio Device" took it's place, which strangely enough made a "Digital Audio (S/PDIF)" option appear in the Playback Devices section of Win 7.

I connected the machine using a displayport to hdmi cable I have to a Westinghouse 32" lcd tv.  Lo and behold, sound.

I think started upgrading nvidia drivers through 3 versions including ISV, the 257.xx Dell package from support.dell.com, and finally the newest release for the 3800FX off nvidia's site which were released yesterday.

Still had sound on the tv, though nothing was ever mentioned by the two installers that had "HDAudio" directories about an audio driver being installed by the nvidia setup.  I can only assume that this is expected (Dell?  Anyone? I can't register on nvidia's site, so I can't ask there....)

Now that I knew that sound was working on the TV, I plugged the m6500 into the eport dock.  No sound.

Nor was there sound coming from the outputs connected to the u3011 when I hooked the displayport cable directly to the display from the 6500.

Just to be clear, I used the displayport cable included in the U3011 package, have tried both ports on the Eport plus dock, and have also tried direct connection to the display from the 6500 via the DP out on the portable itself.  I've tried both 2.0 and 5.1 sound configurations on the 3011.

And a final post. 

It seems that the Nvidia based implementation at least with Displayport "++" out will only support an audio signal being passed over displayport to an external monitor that is no high resolution than 1080HD, or 1920x1080. 

I do not know if this is a limitation of the hardware design or the driver, though there is an ambiguous reference to this deficiency (known issue of sorts) in the pdf readme on nvidia's own site for the latest release of the driver.

Obviously this rules out a substantial number of displays that people would be interested in using with the external output of displayport only equipped machines like my M6500. 

Does anyone at Dell know if this will be addressed by nvidia?  I've tried to create an account on their site to ask the same question, but the registration process seems to be broken.

Considering I'm using about $6K worth of Dell hardware to continue replying to my own post here, I'd really appreciate a response of some sort.  :emotion-7:

Thanks.

Anyone?

Here..another M6500 user who is waiting for a solution.

Anyone?

I've got a Latitude E6500 and a Samsung HDTV.  I went to Fry's and bought a DisplayPort to HDMI adapter, and connected my Dell Latitude to my HDTV.  The picture looks great, but I'm getting audio BOTH from the Laptop AND the Samsung HDTV. And, they're a second or so out of sync, giving an annoying echo effect.  I have no clue how to configure the Dell so that when it's connected to the TV, the audio ONLY comes out of the TV.  There seems to be no documentation from Dell on DisplayPort that I can find.  Does anyone know how to resolve this?  My problem is related to, but opposite, the problem  originallyl posted here back in March, to which nobody at Dell - in fact, nobody so far on Planet Earth - has posted a useful reply.   Not a good scenario!!!