F1 2010 Windowmod and low gamma need help

[Conveen]

Now only 2 problems still with Dx11, when I start the game it is in window mod (the little window you know) I get it in full with ALT+Enter, I know. But this need a fix too aaaannnddd after I start the game it looks very dark. I push back Gamma from 8 to 7 and back to 8 and then the gamma is normal. Why this is so??