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I've set my screen brightness to about 50%. This works fine for me, except that the setting seems to be ignored when it's charging: then it's 100%. I've got a desktop charging stand on my bedside table, and this is exactly the place where I don't need maximum brightness!

How can I make my iPhone respect the brightness setting even when charging?

This is an iPhone 4 (iOS 4.1) but I noticed the same with the iPhone 3G (iOS 3.1.3).

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3 Answers 3

Reset to default
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Upgrade to iOS 4.2. It fixes both the charging brightness and the locked screen brightness bugs. I just tried it and it works.

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I can't seem to reproduce this issue. Is it possible that ambient light is increasing the brightness? Does it still go to 100% brightness if you turn off Auto-Brightness?

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  • There is no ambient light :-) but I will turn off autobrightness and test tonight.
    – Torben Gundtofte-Bruun
    Nov 7, 2010 at 20:58
  • When Auto-Brightness is off, then the brightness is always as specified and not more. When Auto-Brightness is on, then it's much brighter but ONLY at the lock screen -- it dims down to ambient level once I slide to unlock. Is this a bug in iOS?
    – Torben Gundtofte-Bruun
    Nov 7, 2010 at 21:25
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    @torben: I noticed the same thing, and it's very annoying that the lock screen is so bright, especially in a dark room. It only started happening in OS 4.x. I'm hoping it's a bug and not a feature...
    – Senseful
    Nov 8, 2010 at 6:21
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Can't fix it -- currently.

Based on postings so far, this is a bug in iOS 4.1 (less prominent/problematic in 3.x versions).

The only solution would be to upgrade to a newer version when that becomes available if this bug has been fixed in that version.

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