IPhone: How to prevent maximum screen brightness when charging

Because a one-size-fits-all auto-brightness setting is going to be unpleasant for a large number of users, either because the automatically-selected levels are either too difficult to see, too bright, or eat too much battery. The automatic setting is based on the threshold you set specifically so that the device can "figure out" ideal settings within a range that you can tolerate.

More to the point, I have a question for you. Is there a point on the auto-brightness slider that you're comfortable with? If not, that should be all the proof you need that the slider is necessary! If there is a setting that looks ideal all the time, you've got nothing to complain about - the system works for you.

The only way I've found to deal with this on a non-jailbroken phone is to set the side switch to the non-silent setting, plug in headphones and then dock the phone. The chime sound will only play through the headphones and the phone will not vibrate.