Yesterday, the iPhone 13 lineup went on sale, and the first customers immediately noticed that the ProMotion function in the iPhone 13 Pro and iPhone 13 Pro Max smartphones does not always work.
The iPhone 13 Pro and iPhone 13 Pro Max have displays that support adaptive refresh rates up to 120Hz. This feature has been present on the iPad Pro since 2017, but Apple first introduced this feature to the iPhone just this year.
iOS 15 supports ProMotion displays in all apps when scrolling or performing full screen transitions such as switching apps or swiping the Home screen. However, 9to5Mac reports that many animations are still limited to 60Hz.
The iPhone 13 Pro display shows most of the animation at 120Hz, but there are still many animations that don’t use the higher refresh rate. All of Apple’s own apps have correctly implemented smoother transitions across the board, the issue only occurs with third-party apps.
Apple has confirmed to 9to5Mac that developers need to allow their applications to support higher frame rates for custom rendering applications such as games. This is accomplished by the developer adding a new info.plist key to allow their applications to support 120Hz. Apple will soon make this documentation available to developers and a firmware update will fix a bug that prevents refresh rates above 60Hz.
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