Okay so when you say "Or you need to reprogram the internal EDID memory differently for each port". If I have multiple devices connected to the 7850 and I "reprogram the internal EDID memory differently for each port" for each input will they all see the same EDID?
Is the bottom line, there is only one internal HDMI EDID and all inputs will see the EDID written in the internal EDID area when they retrieve the EDID from the 7850 from different inputs? We can change the EDID and trigger a specific input to retrieve the EDID (hpa deassert and assert) but if any other source retrieves the EDID at that point it will get the same exact EDID.