Moin, moin,
Well your question is not really clear, but there is something to say about it.
Usually GPU is the Graphic-Processing-
Unit on your Graphic-Card. I²Bus is a simple Protocol with serial data transport. This bus to slow to transfer Graphic-Data, so I think there is a possibility to configurate the graphic card via the i²Bus. Another possibility would be that you only have to transfer alphanumeric Data, perhaps to an smal LCD-Display.
Greetings // Martin