Windows 8 Brightness Issue

i installed windows 8 along boot camp drivers on imac. i'm having problem display brightness staying @ either 0% or 10%. if change using in method, either keyboard or slider charm, go 0% or 10% within 2 seconds of changing it.

else experiencing issue? didn't have issue developer preview don't know why consumer preview. can't find settings auto-dimming.

 

hello, having same issue on new 13" air. turn , go down 10% 0%.

 

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