I am unable to change lenght of time screen stays bright if device is idle longer than 15 sec. I go to settings, system, brightness, battery power. I have the "Dim if device idle for more than" box checked. I have changed this to 3 min. Then when I turn the device off and then back on it reverts back to 15 sec. This is a pain. How can I get it to stay bright longer than 15 sec? Is there a default setting somewhere that I need to change?
Anyone able to help me? Thanks