Hansku :
http://imgur.com/DEfJ4u5
^I had the same problem after updating my graphics drivers, for some reason this "PnP" thing in "Screens" went off and I just toggled it back on and then I could adjust the brightness again.
Hope the picture explains, because I'm bad at explaining in english.
haleyt :
I also just created an account just to thank you!!
^^^^^^ yup same here... you saved a lot of people's eyes from being blinded after installing windows 10
This one worked for me. I use an Hp envy, 64x
THANKS. THIS ONE WORKED FOR ME ON MY SAMSUNG LAPTOP> I had an Intel graphics card.
STEPS:
1) You have to update the AMD driver on the device manager. Go to settings / control panel -> device manager -> display adapters -> AMD (right click on it and choose update driver) 2) Then, once AMD driver is updated, it will disable the PnP. 3) enable PnP