Random screen dimming on the Xiaomi 15 Ultra can be distracting, especially when you are watching videos, reading, or gaming. The brightness suddenly drops even though you did not touch anything. In most cases, this behavior is caused by display settings that automatically adjust brightness to save power or protect the screen, and you can fix it with a few targeted changes.
Why Your Xiaomi 15 Ultra Screen Keeps Dimming
- Adaptive brightness is adjusting the screen based on lighting conditions.
- Battery saver or performance limits are reducing brightness.
- Extra dim or reading features are enabled.
- Overheating protection is lowering brightness automatically.
- Software glitches after an update affect display behavior.
1. Turn Off Adaptive Brightness
Adaptive brightness uses sensors to change screen brightness automatically. When it misreads lighting conditions, it can dim the screen even when you do not want it to.
Open Settings, and then tap Display.
Tap Brightness level, and then turn off Adaptive brightness.
Manually adjust the brightness slider and test the screen for a few minutes.
2. Check Battery Saver and Performance Settings
Battery saver reduces power usage by limiting brightness and background activity. If it turns on automatically, the screen may dim without warning.
Open Settings, and then tap Battery.
Tap Battery saver, and then turn it off.
Go back to Battery and check Performance mode to make sure it is not restricting brightness.
3. Disable Extra Dim or Reading Features
Some Xiaomi devices include features that intentionally lower brightness for eye comfort. These features can activate accidentally and cause unexpected dimming.
Open Settings, and then tap Display.
Tap Reading mode or Extra dim, and then turn the feature off.
Lock the screen and unlock it again to see if the brightness stays stable.
4. Check Temperature and Overheating Behavior
When the phone gets too warm, the system may lower brightness to protect internal components. This often happens during gaming or extended video playback.
Stop heavy apps, and then let the phone cool down for a few minutes.
Remove the phone case, and then place the device in a cooler area.
Once cooled, check if the screen brightness returns to normal.
5. Restart the Phone
Temporary software glitches can affect how the display behaves. Restarting refreshes system services that control brightness and power management.
Swipe down from the top of the screen, and then tap the Power icon.
Tap Restart, and then wait for the phone to boot fully.
Use the phone normally and observe if the dimming stops.
6. Update the System Software
Display bugs are sometimes fixed through software updates. Running an outdated version can cause brightness control issues.
Open Settings, and then tap About phone.
Tap System update, and then check for available updates.
Install any update and test the display again after the restart.
Random screen dimming on the Xiaomi 15 Ultra is usually tied to automatic features meant to save power or protect the device. Once you disable the settings that control brightness automatically, the screen should remain consistent and easier to use.
FAQs
Why does my Xiaomi 15 Ultra dim more when watching videos?
Video playback generates heat and increases power usage. The system may reduce brightness to manage temperature and battery consumption.
Can adaptive brightness learn my preferences over time?
Yes. Adaptive brightness adjusts based on usage patterns, but it can still misbehave. Turning it off gives you full manual control.
Does random dimming mean my screen is defective?
No. In most cases, this is a software or settings issue, not a hardware problem. If dimming continues after all fixes, a service check may be needed.
