Why does the Xiaomi 15T Pro screen brightness change slightly when playing HDR videos during rotation?

Question

Accepted Answer

Thank you for your support of Xiaomi. HDR videos require special mapping and processing to reproduce brightness, contrast, and color accurately. On the Xiaomi 15T Pro, different hardware units, such as the GPU and DPU, manage brightness adjustments independently. Consequently, slight changes in screen brightness occur when rotating the device between portrait and landscape modes.
This behavior is normal for HDR video rendering and does not affect video quality, color accuracy, or visibility. It allows the phone to adapt dynamically to screen orientation and scene complexity, maintaining smooth playback and proper adjustments across different content.
Brightness fluctuations are usually subtle and part of the device's adaptive display management. This system balances visual consistency, realistic dynamic contrast, and comfortable viewing. You can enjoy HDR content without concern, as these minor variations reflect the device's processing design rather than any hardware issue.