HTC One (M8) for Windows
Adjust Brightness - HTC One (M8) for Windows
Adjust Brightness - HTC One® (M8) for Windows®
From the Start screen, swipe left to display the Apps list.
(located in the lower-right; may require scrolling to the bottom of the Start screen).
Automatically adjust switch
to turn on
If turned off, tap the
Level dropdown menu
then select one of the following:
Adjust Screen Time Out