I am not sure why a processor or AVR would send anything other than a stereo audio signal back to a TV since TVs don't have surround capability. EDID is how a display tells a graphics card what video capability the display has to allow auto sync. It seems you want to add Dirac Live to the system in lieu of REW and the PEQ. No one knows what room correction (if any) the 976 will have but I would expect a basic setup to allow REW and PEQ to be used to mod the room.
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Music system
Model 990/7500/Magnepan 1.6 QRs/Technics SL1200 MK2/Aperion S-12 Subwoofer/OWA3/Sony NS75H DVD
APC H15 Power Conditioner

TV System
Large Advent Loudspeakers/ Polk center/Monoprice surrounds/Panasonic Viera 42 inch/Onkyo HT-RC260/Sony BDP S590/Directv


Home Theater System
Onkyo PR-SC886/Outlaw 7125 Klipsch RF-82 L/R,RC-62 center, RB-35 SR/SL, BENQ HT1075, Outlaw LFM1-EX/OPPO BDP-83/Directv
Harmony ONE
Blue Jeans and Monoprice interconnects
APC H15 Power Conditioner