Hi Torben, On 11.06.2018 22:15, Torben Keil wrote: I have some code sitting here, but when I wanted to clean it up recently, it didn't work anymore as expected. I'll need to debug it with a logic analyzer. Note that the FL2000 can only do I2C transfers of a fixed length of 4 bytes, it was probably really only meant to read EDID EEPROMs. In the original driver, single register writes to the ITE HDMI interface chip that some devices have are first reading 4 registers, then modifying the desired byte, and then writing them back. Regards, Steve