iPhone 8 Plus Screen Auto Dimming

Settings/ general/ accessibility/ display accommadations/ scroll down to auto brightness and turn off

This fixes it: settings/ general/ accessibility/ display accommodations/ scroll down to auto brightness and turn off

Ive experienced the exact same thing.. went back to the store to exchange my phone to a newer one.. what happens is I always have my screen 100% brightness with all the auto dimming settings off and when I start using an app approx. 8 - 15 mins, it starts dimming to 75%, then gets stuck at 50%.. it wouldnt change brightness until 5 mins later.. its irritating because i cant see whats on my phone on bright areas..

Yes... at first it was just the gaming apps and youtube coz it heats up the phone because of the graphic processor.. now even just plain google.. it starts dimming.. I already went to the genius bar at best buy and still nothing.. so im assuming its an iOS bug that they need to fix or the LCD screens they use are just bad..

Hello,

I have the situation on my iPhone 8 Plus (64 GB) with iOS 11.4 (15F79).
I researched and found out that this is an OS setting in order to prevent the overheating of the phone.

The place where I can see this the most is when I am playing PUBG Mobile. I know that it is a demanding game, but I don't like this solution. I prefer to have an overheated phone and play as I wish, with 100% brightness maybe.

Honestly this is my first iOS phone ever. I came to this system to look for stability, liability and smoothness. I heard that this is what Apple is best at. It's starting to look like a small lie to me because of this. And that's not all; above this there are problems with the smoothness in the menu, in the wallpapers for example. If you scroll through the 24 static pictures that they have stock, you can clearly see stuttering. I have an eye for details and I care about them. This is annoying for me. Now just imagine how annoying can be the phone when it dims your screen brightness and you can't do anything about it.
Please fix this. Otherwise I am seriously thinking about moving back to Android. In the end all the phones are stuttering and lagging and chopping when scrolling or in other animations. At least Android is more permissive and the phones with Android are usually a better bargain for the money. I am talking big resolution OLED screens, best cameras, better designs (I mean iPhone 8 and 8 Plus are really outdated from the design perspective).

Also, if anyone else heard anything related to this issue, please inform us.

Thank you if you read this.

Go to Settings/General/Accessiblity - Display Accommodations and turn off Auto Brightness. Then go to Zoom (in the same place) and turn it off.

If the brightness continues to dim on its own that means that they phone is approaching the upper limit of its operating temperature range and it is dimming the screen to reduce the heat load. The alternative would be for the phone to abruptly shut off when it reached the temperature limit.

I’ve had the same issue with dimming. It is soo dim I can barely see what is on screen. I noticed it always happens during the daytime and when it is sunny out. I also noticed the phone is usually hot and it is below 50% battery life.

Same with mine, purchased one month ago. I read answers and will try white point reduction

We have all tried that. It’s not an auto brightness thing. It’s a temperature thing. The screen is doing it independent of auto brightness.

There’s an issue with some cases causing the phone to overheat. I noticed this because I’ve owned multiple iPhones with the same case and some hold the heat in.

I just replaced my one day old iPhone 8 plus because the screen brightness at 100% wasn't even a normal 50% brightness on a normal iPhone, they told me it was the first time they have this problem at this Verizon store in California

Apple's making us work for it. Now it's buried inside the Accessibility settings. To get there, select "General" in the Settings app, then "Accessibility." On the next page, tap on "Display Accommodations" and you'll see the toggle for "Auto-Brightness."

Why is Apple making it harder for users to disable auto-brightness in iOS? Who knows. Maybe they're trying to reduce the number of people who complain about horrible battery life on their iPhone, which would explain their note that settings caption that "Turning off auto-brightness may affect battery life." Still, I thought that was fairly obvious.

Apple's making us work for it. Now it's buried inside the Accessibility settings. To get there, select "General" in the Settings app, then "Accessibility." On the next page, tap on "Display Accommodations" and you'll see the toggle for "Auto-Brightness."

Your suggestion to turn off Zoom worked like a charm! Thank you so much! My 7+ had a problem with brightness. Even turned up to 100%, the display was only around 50%. I followed your directions and it is back to normal.