My phone’s screen is too dim to see when I’m in a dark room. Does this mean my auto-brightness control is broken?
Not brokenjust out of whack. Luckily, you can recalibrate the phone’s light sensors to make the screen brighten and dim properly. Apple’s iOS allows you to adjust brightness levels on an iPhone even when auto-brightness is turned on, so you can use built-in controls to get the sensors working again. To recalibrate the setting, turn auto-brightness off in Brightness & Wallpaper settings. Then go into an unlit room and drag the adjustment slider to make the screen as dim as possible. Turn auto-brightness on, and once you head back into the bright world, your phone should adjust itself. If it doesn’t, follow the exact opposite procedure with a bright light, bringing up the brightness to its maximum level with auto-brightness turned off and then turning it back on.
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Because Android devices make you choose between auto-brightness and manual controls, you’ll need an app to override the system’s screen controls. I like Lux Auto Brightness, which provides the equivalent of iOS screen system settings, along with controls for specific apps and times of day
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