How to quickly remove screen dimming on Xiaomi phone

The problem of spontaneous brightness changes in the display is familiar to many owners of smartphones Xiaomi, Redmi and Poco. Often the device reacts to the change of lighting in the room too aggressively, making the image almost unreadable even when the lights are on. This is not only annoying when reading or watching video, but can significantly accelerate battery discharge if the system mistakenly twists the backlight to the maximum.

At the heart of this phenomenon is the operation of an ambient light sensor that is built into the top of the body. MIUI algorithms sometimes interpret sensor data incorrectly, especially if a low-quality protective film is pasted on the screen or if the finger covers the area of the sensor during use. Understanding how this system works is the first step to solving the problem.

Fortunately, the HyperOS shell and earlier versions of MIUI have a lot of fine-tuning tools in it. You can completely disable automatic adjustment, customize profiles for different applications, or even fix software glitches that cause dimming. Next, we'll look at all the available methods from simple switches to hidden engineering menus.

Turning off automatic brightness control

The most obvious and effective way to combat unwanted dimming is to completely abandon automatic mode. In the standard state, the smartphone itself decides how bright the image should glow, based on the sensor readings. However, in most scenarios, manual control is much more convenient and predictable.

To take control of the backlight, you need to go to the control center. Swipe down from the top right corner of the screen (or from the left, depending on the navigation settings) to open the notification curtain. Find the brightness slider and click on the A or sun icon next to it. If the icon is on blue, automatic mode is active.

Once the function is turned off, the slider will be available for manual movement, and you can now set a comfortable level of backlight that will not change whether you are in a dark room or in the bright sun, which is especially true for users who often use the phone in unstable lighting conditions.

⚠️ Warning: When you turn off autobrightness at night, monitor the level of backlight so as not to damage your vision. Too bright in the dark causes rapid eye fatigue.

Importantly, after manual brightness changes, the system may suggest that you turn on automatic adjustment again after a while, a behavior that is embedded in the logic of Xiaomi's intelligent algorithms, which are trying to optimize power consumption. Just ignore these suggestions if you want a stable result.

Configure advanced display parameters in MIUI

The MIUI shell and the new HyperOS offer deeper settings that go beyond just a slider. The display menu contains features that allow you to tailor your screen to specific use cases. Here you can find options that affect color reproduction and backlight behavior depending on the content.

Go to Settings → Screen and Brightness. In this section, you should pay attention to the "Read Mode" or "Paper Mode" item. Sometimes users confuse dimming with the operation of this filter, which makes the screen yellowish and less bright to simulate a book. Make sure that this mode is turned off or customized to your liking.

This section may also include the option “Adaptive Color Temperature” which changes the screen’s hue depending on the time of day, which can subjectively be perceived as a change in brightness. For maximum image stability, it is recommended to switch the color scheme to Standard or Saturated mode, turning off any automatic corrections.

The Dark Theme feature deserves special attention. Although it is designed to reduce eye strain, in some applications it can conflict with brightness settings, causing incorrect dimming of individual interface elements. If the problem only manifests itself in specific programs, try changing the theme settings for them individually.

Effect of protective glasses and covers on the sensor

Physical obstacles are one of the most common causes of ill-functioning light sensors. The sensor in Xiaomi smartphones is usually located at the top of the screen, often near or embedded in the speaker, and if you use a black-framed protective glass or poor quality film, they can overlap the sensitive element.

Even microscopic dust or greasy spots in the sensor area can distort the readings. The algorithm receives a signal that it is “dark” and programmatically reduces the brightness of the display. Regularly wiping the top of the screen with a soft microfiber cloth helps to eliminate this problem without changing the system settings.

Cases play a special role. Some case models have high sides that, at a certain angle of grip, can create shadow on the sensor. If the blackout only happens when you hold the phone in your hand in a certain way, it's likely that it's the shadow of your finger or the edge of the case.

Software failures and screen calibration

Sometimes the problem is not physical obstacles, but a software failure of the Android system itself or the MIUI shell. The service responsible for brightness control may “hang” or misread data after updating the firmware, in which case software recalibration or resetting is required.

The first step is to calibrate through the engineering menu, enter the code ##6484## in the phone book (or go to the debugging menu if it's on), find the section associated with the display or sensors, and perform the calibration procedure, which will force the system to read the minimum and maximum brightness values again.

If calibration doesn’t work, try resetting all apps or resetting your phone completely (backing up beforehand). Often conflicting cached data from third-party apps can interfere with system functions, causing dimming.

⚠️ Warning: Before entering the engineering menu, make sure you understand the function function. Changing unknown parameters can cause the device to function unstablely.

Also worth checking for system updates. Xiaomi developers regularly release patches that fix power and display management bugs. Go to Settings → About phone and click on MIUI to check the software's relevance.

Specific settings for AMOLED and LCD matrices

The type of matrix in your smartphone directly affects the behavior of brightness. AMOLED-screens (e.g. Xiaomi 13, Redmi Note 12 Pro) use PWM technology to adjust brightness at low levels, which can create a flickering or visual dimming effect that is perceived as a defect.

In new versions of the firmware for AMOLED-You have a flicker protection or an anti-flicker feature that changes the way the lighting works, making the dimming more smooth and less visible to the eye. You can find this setting in the Settings menu. → Screen. → Protection against flickering.

For LCD-Another problem with screens is the uneven lighting of the edges ("glow" or "darkness" at the corners). This is a hardware feature that cannot be fixed software. However, including a dark theme helps to make these defects less noticeable when using a smartphone indoors.

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For AMOLED screens, try setting a static black image for a few minutes. If the dimming is uneven (spotting), this may be a sign of pixel burnout, not a setting failure.

Owners of 120Hz refresh rate devices should know that when they go into power saving mode, the system can force the frequency and brightness to decrease. Check if you have activated the Ultra Battery Saver mode, which limits the display performance to save charge.

Third-party applications for brightness control

If standard tools aren't enough, Google Play Store apps come to the rescue, like Screen Dimmer or Twilight, which allows you to create your own brightness profiles that can override system settings, making the screen even darker than the minimum system level or, conversely, fixing the brightness.

These applications work by overlaying a translucent filter over the entire interface, which bypasses the sensor's hardware limitations, but it's worth remembering that running these programs in the background can consume additional battery power.

When selecting an application, pay attention to the permissions requested. Brightness control usually requires "Above Other Windows" permission. Don't give questionable programs access to contacts or the file system unnecessarily.

• 📱 Screen Dimmer is a simple application with the ability to create profiles by time.
• 🌙 Twilight – focuses on reducing the blue spectrum, but has flexible brightness settings.
• 🔆 Auto Brightness Tester – a utility for checking the operation of the sensor and calibration.

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Third-party apps are an effective “crutch” if your Xiaomi hardware sensor is physically faulty or malfunctioning at the firmware level.

Frequently Asked Questions (FAQ)