After iOS 17.0.2 update I noticed my screen changing screen lighting while the screen was set at 100% light, ended up removing the phone case and the camera and around it it was warm. Currently the back of the phone cooled off after about 20 minutes of issues.
iPhone 11 Pro Max, iOS 17
Hi there nelu86,
If you have auto-brightness turned on for your iPhone, it's normal for the display to dim. Learn more about that here: Adjust the brightness and color temperature on your iPhone or iPad - Apple Support
Also, the screen can dim if your iPhone gets too hot. This link provides more information about how that works: If your iPhone or iPad gets too hot or too cold - Apple Support
If you didn't see a temperature alert appear on the screen, there shouldn't be any cause for concern.
If this behavior persists, you'll want to reach out to Apple Support directly for further assistance. They're best-equipped to take a closer look at the issue and provide some additional guidance. This link will help you get started: Apple Support
Take care.
iPhone 11 Pro Max screen keeps dimming and back of phone warms up after software update 17.0.2
