If the display on your Xiaomi 15 Ultra looks too dim, too bright, or keeps changing brightness on its own, it can quickly become annoying. You may notice it most when using your phone outdoors, watching videos, or scrolling at night. In most cases, brightness problems are caused by display settings, sensor behavior, or power-related features, and they can be fixed without any advanced steps.
Why Your Xiaomi 15 Ultra Has Display Brightness Issues
- Auto brightness is reacting too aggressively to lighting changes.
- Sunlight mode is interfering with normal brightness control.
- Battery saver features are limiting screen brightness.
- Adaptive display settings are misreading ambient light.
- Temporary system glitches after updates or long uptime.
Auto Brightness Is Enabled
Auto brightness adjusts the screen based on surrounding light, but it can sometimes overcorrect. This often causes the screen to dim suddenly indoors or stay too bright in darker environments.
Open Settings, and then tap Display.
Tap Brightness level, and then turn off Auto brightness.
Manually adjust the brightness slider and observe if the screen remains stable.
Sunlight Mode Is Causing Overbrightening
Sunlight mode boosts brightness when the phone detects strong light. In some situations, it stays active longer than needed, making the screen uncomfortably bright.
Open Settings, and then tap Display.
Tap Sunlight mode, and then toggle it off.
Check the screen brightness again under normal lighting conditions.
Battery Saver Is Limiting Brightness
When battery saver is enabled, the system reduces brightness to conserve power. This can make the display appear unusually dim even when the slider is set high.
Open Settings, and then tap Battery.
Tap Battery saver, and then turn it off.
Return to the display and adjust brightness again.
Adaptive Display Settings Are Misbehaving
Adaptive display features learn from your usage patterns. If the learned data becomes inaccurate, brightness behavior may feel inconsistent.
Open Settings, and then tap Display.
Tap Adaptive brightness, and then reset or disable the feature.
Use manual brightness for a while to see if stability improves.
Restart the Phone
Temporary system issues can affect how the brightness sensor works. A restart refreshes display services and recalibrates sensors.
Swipe down from the top to open Quick Settings.
Tap the Power icon, and then tap Restart.
After rebooting, test brightness in different lighting conditions.
Check for Software Updates
Brightness bugs are sometimes fixed through system updates. Running outdated software can leave known display issues unresolved.
Open Settings, and then tap About phone.
Tap System update, and then check for available updates.
Install any pending update and restart your phone afterward.
Brightness problems on the Xiaomi 15 Ultra are usually tied to smart features trying to optimize your experience. Once you regain manual control or reset these settings, the display should behave consistently again and feel comfortable in any environment.
FAQs
Why does my Xiaomi 15 Ultra dim the screen even when brightness is set high?
This usually happens when battery saver or adaptive brightness is active. These features override manual brightness to save power or respond to lighting.
Is auto brightness bad for the display?
No, it does not damage the screen. However, it can feel unreliable if the light sensor misreads your surroundings, which is why some users prefer manual control.
Can a screen protector affect brightness behavior?
Yes. Thick or tinted screen protectors can interfere with the light sensor, causing inaccurate brightness adjustments.
