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I've got an iPad 3 on iOS 5.1. When reading occasionally my screen will dim before I interact with the screen; it doesn't turn off and lock but it dims.

How can I lengthen the timer for this? Is it the same option as the "Auto Lock" timeout in the Settings app?

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It is determined by the Auto Lock time and cannot be set independently of it. The Auto Lock can be changed in Settings > General > Auto-Lock. The longer you set it to not auto-lock, the longer the display will maintain it's normal brightness.

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Specifically it looks like it dims 15 seconds before the screen turns off entirely from my extremely limited testing. – user75532 Apr 12 '14 at 16:15

Add this line to your piece of code in App Delegate after didFinishLaunching.

[[UIApplication sharedApplication] setIdleTimerDisabled:YES];
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