While messing a bit with the (offical) SDK for the 9860, these two issues happend: First, when opening a file from the SD-Card after initializing grayscale, the screen leaves blank, when you try to swap the buffers and second, reading from SD-Card causes heavy flicker. I tried to make a simple videoplayer, so I simply repeatedly loaded the first 1024 bytes of a file in the first buffer, and the next 1024 in the second buffer and so on.
So the question is: Is there a way to make the grayscale smooth while IO or is there no way to fix it by design of the creation of gray?!