We are currently developing a monitor product using ADV7612 chip.
We got troubles to change HDMI contrast from the chip.
The register settings we used for the chip has been attached.
To change the contrast we write the value to 0x3A register at address 0x44.
i2c_write_byte (I2C_HDMI_BASE, 0x44>>1, 0x3A, value);
We have verified that I2C is OK and value is written to the register successfully.