same as 791290

Note： the screen brightness don't decrease，but as as the current EDRHeadroom is reduced, the display will gradually dim, and the HDR content will eventually be tone-mapped to SDR by the operating system.

My question is why in my iPhone (eg iPhone15, iPhone 12 Pro, etc..), when i loop an HDR video in Photos APP or display HDR content on the screen via AVSampleBufferDisplayLayer, just wait after 20-40 minutes, the display will dim and the current EDRHeadroom will be reduced gradually, and the operating system will tonemap it to SDR. However, this issue does not occur on the iPad.

I provided my test project in the bug report FB18502486.，

Why does it work fine on iPad devices, such as iPad Pro 12.9-Inch 5G, but not on any iPhone?

facing the same issue. download the app from APP Store, and uninstall it. then you can install it using Xcode