The board is a new board that is based on the Irrevium board. The Irrevium board works.
The new board works with PC and the HPA (hot plug) works also. The XBOX doesn't look normal because it does eight clock ticks then the clock is high for 2ms and then 8 clock ticks etc.... The PC does more normal I2C in that it does 16 clocks with address and data. The XBOX may later do this but did not capture that. Is the Xbox expecting something from the 7612 other than the EDID. It is not the HDCP because the Irrevium board uses chip without it. Just looking for a clue.