T500 Displayport to HDMI no video

I have a T500 model 2081-CTO running XP pro with the ATI mobility Radeon HD 3650 card. I run dual monitors at office & home office via port replicators & DVI.
I'm trying to use use an HDTV as external monitor. (I've read the thread on the Displayport not carrying audio; while disappointed with that SNAFU, I'm just trying to get display at this point.) I picked up a displayport to HDMI adaptor and then run the HDMI cable into an AV reciever which patches to the HDTV. I've updated the ATI driver, but just no luck so far. Pretty sure I have the AVR set as pass-through of the signal. Have others done any HTPC set up with this configuration using displayport to HDMI adaptor?
ThinkPad T500 Model 2081-CTO;
various other models

I don't think there is any separate driver for the DisplayPort; it is part of your ATI video driver.
You must set your T500 to use the ATI graphics (not Intel graphics) in order to output digital video (either DVI or DisplayPort). You probably already know this since you've been using the dock DVI, and are talking about the ATI driver.
Some HDTVs can be finicky about what signals they accept. You might try Googling your HDTV model to find tips and hints from other owners, in other forums.
If you could test your T500 & DisplayPort-HDMI cable with another monitor (preferably one meant to be used with computers rather than as an HDTV) that would give confidence that your T500's DisplayPort and cable are working ok.
Your vision of wireless keyboard+mouse to T500 displaying through your HDTV sounds good! It should be possible -- hopefully you can get it working with a little help.
Best regards,
Frank
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T500 Displaypor​t to HDMI no video

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T500 Displayport to HDMI no video