have installed latest Win 10 64 on my iMac 2007.
Everything works fine, just the brightness slider is missing in the settings.
I have Win 10 64 on another iMac (2010) and there the slider is not missing and it works great.
does anybody know how to stop Win 10 from changing the display brightness each time I connect / disconnect the charger? To prevent any misunderstanding, I am not reffering to the adaptive display settings regarding specific power plans.