Brightness drop in Dark Mode on my iPhone 12 Pro

I have 12 pro ,

Sometimes when using it, there is a brightness drop when dark mode is on. Is it a bug or an issue with the phone?


[Re-Titled by Moderator]

Original Title: Brightness Drop

iPhone 12 Pro, iOS 18

Posted on Jun 21, 2025 05:59 AM

Reply
9 replies

Jun 21, 2025 11:09 AM in response to imesh274

imesh274 wrote:

94%

Ok, automatic brightness decreasing is usually caused by your device becoming too hot, so it automatically decreases the brightness to try and cool itself off. I think this is what you are seeing.


Next time this happens, feel the device’s screen with the back of your hand. If it’s hot then my theory is confirmed. However it’s not any cause for alarm. Your iPhone has built in temp sensors, and will do things to protect itself from overheating, such as lowering the brightness. And you will see an alert onscreen when the iPhone does actually overheat.

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Brightness drop in Dark Mode on my iPhone 12 Pro

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