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You should probably have it checked out at the Apple store. I've used auto-brightness for 3 years now and this does not describe my experience at all.

I really think something's wrong with your phone.

Odd

Thing is it is fine on my iPad

With auto brightness on right now at 20.30 at night the screen is too dark for me
 
I have ~35% brightness level and autobrightness on. In all honestly I don't even notice the difference, but had no problems so I'm good ;)
 
Think I will just leave auto brightness off as the screen is too dark when at night
 
The front plate where the sensor is, is screwed up on my iPhone 3G. So I have it turned off because something with the front plate is messing up what light the sensor sees so it screws up the auto-brightness. I manually change the brightness between night and day.

I know I need to get a new front plate.
 
I leave it off because the only way for the auto brightness to work is to unlock your phone and a lot of time I'm using the lock screen to reply to texts. I have a jailbroken iPhone so SBSettings allows me to change the brightness super quick without having to go into settings anyway.
 
To all you 'special needs' people it only checks it once. When you unlock the phone. No it doesn't take extra battery life unless you're locking and unlocking the screen every 3 seconds.
 
Here in Washington state, weather is never a factor for screen brightness, so I've kept my auto brightness off, with a constant 60% brightness.
 
Yeah but it's more annoying than it is useful. It's not bad half the time but the other half I just get a really dark screen after bringing my phone back from standby. I have to press the shoulder button twice to get the proper brightness.

Also, I just adjust the brightness manually when in a movie theatre. :D
 
Mine's at around 45%, auto-brightness off. When I first got an iPhone I was told that having it on was a major battery drain, so I've never used it. I put it on for a few hours today after reading this thread but I found it annoying.
 
One question does it hurt your battery life to have auto brightness on? Or doesnt it matter much?
 
Brightness = 50%
Auto Brightness = On

And i think having auto brightness on helps with battery cause it dims it when you are in low light so that can save some battery i guess...
 
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