Yes they do connect audio video when switched through the AVR!
As far as U-Verse and and the DVR goes, I got the TV as part of the deal, only to avoid a one time installation fee, their C/S said they would have to charge me a 1 time installation fee of around $298 if I am getting only the internet and the phone! But add the TV, at least for a month, and they would waive the installation fee! So I said add it for sure (I would end up paying a month's subscription of $28 for the TV instead of the $298). I got HD free for 12 months and the basic service (U-Family) plus HBO and other stuff free for 3 months as well! So I would disconnect the TV next month and will be back to the OTA channels and Netflix, Amazon VoD, VUDU and Hulu soon! I never had Cable / Satellite before this with Comcast or anyone else, just the OTA! I got the TV Tuner card on the HTPC because I couldn't resist a deal I found on Amazon for $45 (retail not OEM)!
So I don't mind being S-O-L with the cable card tuner, was never planning on investing in that at all!
Explained this just to satisfy your curiosity, now back to the reason for the thread!
I am open to trying to switch everything via HDMI3/DVI on the TV but and trying to apply the patch that you talked about- now that is a Microsoft patch does that mean it would work only on Microsoft OS systems like the HTPC and DVR is Windows based as well I believe, what about the other systems! I don't want to loose HD audio and 7.1 surround sound for sure, so whatever works will be good!
Here is my question though, now we identified the AVR as the issue and that the HTPC res is fine when connected directly to the TV, isn't there any adjustments that I can do on the AVR (or on the TV) to get that adjusted? Instead of shifting everything to HDMI3 on the Samsung?
Oh and I use a Logitech Harmony remote for all the above devices so switching between inputs is one touchscreen button operation with that once programmed, no issues at all, I just hit Watch HTPC and the remote does the rest, that is why I said I don't mind the HTPC to HDMI3 conenction!