Despite what is suggested in documentation UIScreen brightness is NEVER restored after app backgrounds

Originator:eric.patey
Number:rdar://17017247 Date Originated:5/23/14
Status:Duplicate/15363763 (Closed) Resolved:
Product:iOS Product Version:iOS 7.1 (11D167)
Classification: Reproducible:
 
Summary:
If the user presses the home key to background my application after it has lowered the UIScreen brightness, it will NEVER be restored. The user is forced to manually reset the brightness.

Steps to Reproduce:
1. While foregrounded, programatically reduce the [[UIScreen mainScreen] brightness] to 0.1.
2. User presses the home button


Expected Results:
As suggested by documentation quoted below, the brightness should be restored so that the user can see the home screen.

"So if you change the value of this property, you do not need to record the previous value and restore it when your app moves to the background."


Actual Results:
The OS never restores the brightness to the system level. The user must manually restore the brightness - which may be quite challenging since the screen is essentially black at this point.

Version:
iOS 7.1 (11D167)

Notes:
This is a very serious bug for use for two reasons.

The first is that, by dimming the screen, we were able to save material battery drain by reducing the screen's backlight.

Second, it is VERY hard for the typical user to recover from this situation.

Configuration:
iPhone 5, AT&T

Comments


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