How to Recover Data from Xiaomi Phone with Broken Power Button

Xiaomi phone auto-brightness not working is usually caused by a disabled adaptive brightness setting, a stuck brightness sensor, cached system behavior after an update, or battery-saving restrictions. The fastest fix is to re-enable adaptive brightness, clean the top sensor area, restart the device, and reset brightness behavior in HyperOS settings.

Steps

Open Settings > Display and turn Adaptive brightness or Auto-brightness off, wait a few seconds, then turn it on again.
Clean the area around the front camera and earpiece, because dirt, a thick screen protector, or a case edge can block the brightness sensor.
Restart the Xiaomi phone to refresh sensor services, especially after a HyperOS update or display setting change.
Turn off Battery saver and any aggressive power mode, then test brightness changes under strong light and in a dark room.
Update HyperOS and system apps, because a xiaomi auto brightness broken issue can appear after firmware bugs and may be fixed in later patches.

🤔Note:

Indoor lighting often does not change enough to trigger obvious brightness adjustments. Always test auto-brightness in direct sunlight and in a very dark room for more reliable results.

Common Issues and Fixes

Brightness never changes: likely cause: adaptive brightness is disabled or bugged; fix: toggle the setting off and on, then restart the phone.
Brightness stays too low outdoors: likely cause: blocked or dirty sensor; fix: remove the case or screen protector temporarily and clean the sensor area.
Brightness works only after manual adjustment: likely cause: learned brightness behavior is inaccurate; fix: set brightness manually for a few days with adaptive mode enabled so HyperOS recalibrates.
Auto-brightness fails after update: likely cause: HyperOS software conflict; fix: install pending updates and reset display preferences if available.
Brightness changes are delayed: likely cause: battery optimization or overheating control; fix: disable power saving and let the device cool before testing again.

Option	Best For	Limitation
Toggle adaptive brightness	Temporary software glitches	May fail if sensor is blocked
Clean sensor area	Sudden sensor misreadings	No effect on firmware bugs
Restart device	Post-update issues	Not a permanent fix
Disable battery saver	Delayed brightness response	Higher power use
System update	HyperOS bugs	Depends on patch availability

Quick Tips

Lighting matters: Test under direct sunlight and near a lamp. Indoor room light often changes too little to confirm sensor response.
Check the protector fit: Some tempered glass protectors cover the top sensor window unevenly. Removal can confirm a sensor obstruction in minutes.
Disable display filters: Extra dim mode, reading mode, or bedtime mode can make fix adaptive brightness HyperOS attempts seem unsuccessful. Disable all display filters before testing.
Consider hardware issues: If manual brightness also behaves abnormally, the problem may be hardware-related rather than a simple setting issue.

💡Protip:

If adaptive brightness feels inaccurate, keep it enabled and manually correct the brightness for a few days. HyperOS can gradually relearn your preferred brightness levels based on your adjustments.

Why is Xiaomi adaptive brightness not learning correctly?

HyperOS can take time to relearn brightness habits after updates or resets. Manual brightness adjustments while adaptive brightness remains enabled can gradually improve behavior.

How to check if the Xiaomi brightness sensor is faulty?

If auto-brightness never reacts in bright light after cleaning, restarting, and removing accessories, the brightness sensor may be failing. A hardware check or service inspection is usually required.

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