I2C write with lage size of data problem via Display port

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Hi.
I’d like to know the max size of data on I2C_write and read function.
I can send more then 32bytes via DVI dual link cable.
But It is not working when I send exactly same size of data via display port(dp).
It return only nvapi_error ( it is generic error).

Let me get it if you have any information about this.

Thanks