The last week or two my iphone 4 started dimming it's screen to almost black whenever I lock it. Then when I unlock it I have to get to the brightness slider and move the slider to restore light to the screen.
Can anyone explain why this is happening and how to fix it?
Best Answer
I've had that issue before, and it indeed seems to be a bug of sorts. As evidenced by the fact that one shouldn't have to hold their phone up to direct light, or manually adjust brightness on a frequent basis.
I would recommend starting with a phone reboot - hold down the power and home button until you see the Apple logo. This may help the situation
Next, you could also try turning off "Automatic Brightness". Open the Settings app, tap "Brightness & Wallpaper", then switch "Auto-Brightness" off.