Why does the brightness dim on iphone12 when auto is set off?
This is a serious bug!
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There are several features that can cause the screen to dim:
- Settings/Face ID & Passcode/ Attention Aware Features.
- Settings/Accessibility/Auto Brightness.
- Settings/Face ID & Attention/Attention Aware features (actually another way to activate the first one).
- In addition, the screen will dim a few seconds before the phone locks if auto-lock is enabled.
You also have a strange idea of what a “serious bug” is. A serious bug is a phone that crashes every time you try to access an app. What you describe is a minor annoyance.