If the screen on your Xiaomi 15 Ultra stays too bright or too dim, even when lighting conditions change, adaptive brightness may not be working properly. This can strain your eyes, drain the battery faster, and make the phone uncomfortable to use indoors or outdoors. The issue is usually caused by settings conflicts, sensor behavior, or system restrictions, and you can fix it with a few targeted steps in 2025.
Why Your Xiaomi 15 Ultra Adaptive Brightness Is Not Adjusting
- Adaptive brightness is turned off or not responding correctly.
- The light sensor is blocked by a case, dirt, or screen protector.
- Manual brightness changes are interfering with adaptive learning.
- Battery saving features are limiting display behavior.
- Temporary system glitches affecting the display sensor.
1. Make Sure Adaptive Brightness Is Enabled
Adaptive brightness must be turned on for the phone to adjust the screen automatically. If it is disabled, the brightness will stay fixed no matter how lighting conditions change.
Open Settings, and then tap Display.
Tap Brightness level, and then enable Adaptive brightness.
Lock the screen and unlock it again to let the sensor recalibrate.
2. Manually Adjust Brightness Once
Adaptive brightness on Xiaomi devices learns from your usage over time. If the system gets confused, making one manual adjustment can help it relearn your preference.
Swipe down from the top of the screen to open Control Center.
Adjust the brightness slider slightly, and then lock the screen.
Use the phone normally and see if brightness starts adjusting again.
3. Check the Light Sensor Area
The light sensor sits near the front camera and can be blocked easily. When it cannot detect ambient light properly, adaptive brightness will not respond.
Inspect the top area of the screen, and then clean it gently.
Remove thick cases or dark screen protectors temporarily.
Test adaptive brightness in a well-lit area.
4. Turn Off Battery Saver Mode
Battery saving features can limit background sensors to reduce power consumption. This may prevent adaptive brightness from working correctly.
Open Settings, and then tap Battery.
Tap Battery saver, and then turn it off.
Check if the screen now adjusts when lighting changes.
5. Restart the Phone
A restart refreshes system services and resets sensor behavior. This often fixes adaptive brightness issues caused by temporary software glitches.
Swipe down from the top to open Control Center.
Tap the Power icon, and then tap Restart.
Wait for the device to reboot fully and test the display again.
6. Update System Software
Display and sensor bugs are often fixed through software updates. Running outdated software can cause adaptive brightness to behave unpredictably.
Open Settings, and then tap About phone.
Tap System update, and then check for updates.
Install any available update and restart the phone.
Adaptive brightness on the Xiaomi 15 Ultra usually works reliably once the sensor and system settings are properly aligned. After these adjustments, the screen should respond smoothly to changes in lighting throughout the day.
FAQs
Why does adaptive brightness feel inconsistent on Xiaomi phones?
Xiaomi uses an adaptive learning system that adjusts based on your habits. If you frequently change brightness manually, it may take time for the system to relearn your preferences.
Can screen protectors affect adaptive brightness?
Yes. Thick or tinted screen protectors can block the light sensor, which prevents accurate brightness adjustments.
Does adaptive brightness save battery on the Xiaomi 15 Ultra?
Yes. By lowering brightness in darker environments, adaptive brightness helps reduce power consumption while keeping the screen comfortable to view.
