brightness change to dark when i full screen the video

hi
I have use k-lite for years and very good than other
but recently I change my laptop to ultrabook yoga2 pro
with graphic intel family
unfortunately when start watch video at full-screen mode brightness reduce to dark
only brightness work good t window mode

I uncheck automatically brightness change but still problem remain


please guide me what is problem ?

There is a similar option in the control panel of the Intel graphics driver. You can usually access those settings by right-clicking on your desktop. If you don't see it, then manually install the Intel driver to add it.