Modern Xiaomi smartphones are equipped with advanced display control systems that are designed to save battery power and protect the user's vision. However, often automatic brightness control works incorrectly: the screen can seem too dim even in bright sunlight, or, conversely, blind your eyes in the dark. Many owners of Redmi and Poco devices face the need to manually increase the level of illumination, which negates the convenience of using the gadget. Understanding how to increase the avrightness on Xiaomi, allows not only to improve the visual experience, but also to extend the battery life of the device through better control of the light sensor.
The problem is often not hardware faults, but rather software algorithms like MIUI or HyperOS shells, which can be too conservative in their default settings. The system tends to minimize power consumption, which may understate the maximum threshold for autobrightness. In this article, we’ll look at all the customization methods available, from standard menu switches to the use of engineering codes and third-party applications, to help you achieve the perfect balance between viewing comfort and energy efficiency.
Standard brightness setting in the MIUI menu
The first step for any user is to check the basic settings of the system, and this is where the basic controls of the display are often ignored, and first you have to lower the notification curtain and find the brightness slider, and next to it is usually the "A" button or sun icon that activates the automatic mode, and if this mode is on, the system makes its own decisions about how bright the screen should glow, based on the sensor readings.
To adjust the behavior of autobrightness in more detail, you should go to Settings → Screen → Brightness Level. Here it is important to pay attention to the item “Adaptive Brightness” or “Autobrightness.” In the new versions of the HyperOS shell, the learning algorithms have become smarter: they remember your manual adjustments in different lighting conditions. If you regularly twist the slider to the maximum when you go out, the system should eventually start doing it itself.
However, if standard methods don’t work, it’s worth checking for system updates. Xiaomi engineers are constantly improving display drivers and approach and light sensor algorithms. Sometimes the problem is solved by simply updating the firmware that corrects calibration bugs. This menu may also include the option “Read Mode” or “Vision Protection”, which overlays a yellow filter and reduces perceived brightness, even if the physical illumination is working at full.
⚠️ Attention: It is not recommended to constantly use maximum brightness in low light conditions, as this can lead to rapid eye fatigue and headache, as well as accelerate burnout. OLED-matrices on flagship models.
Calibration of the light sensor through the engineering menu
If the software settings don't work, and the screen still seems dim, maybe the light sensor is miscalibrated or malfunctioning. There's an engineering menu in Xiaomi smartphones to access the deep hardware settings. It's a powerful tool that lets you test hardware and recalibrate the sensors. To get there, you have to open the Phone app and type in a special code.
Type in the dialer code ##6484##. The CIT menu will open. The test list will look for a item associated with the light sensor. It can be called the Light sensor, the Proximity & Light sensor test, or it can have a number that depends on the device model. Inside this test, you will see the current readings of the sensor in the suites. Close the top of the screen with your hand to simulate the darkness, and remove it by bringing it to the light source. The values should change smoothly and significantly.
If the values do not change or change in a jumping fashion, it is possible that the sensor is contaminated or closed with a protective glass. In some versions of the CIT menu, there is a button "Calibration" or "Sensor Calibration" that clicks on it will start the recalibration process, during which you will need to follow the instructions on the screen (usually you need to close and open the sensor several times).
What if the code doesn't work?
Use of third-party applications to control illumination
When MIUI is not built in, Google Play Store apps developed by enthusiasts to fine-tune the screen come to the rescue, and these programs can take control of the light sensor and use their own algorithms, which are often more aggressive and efficient than standard ones. One of the most popular solutions is the Lux Auto Brightness app.
The principle of these applications is to create your own brightness profile. You can set dots on the graph: for example, at 10 lux set the brightness of 15%, and at 1000 lux (bright day) – 90-100%. The standard Xiaomi system can limit up to 60-70% even in bright sun to save the battery, while third-party software will squeeze the maximum out of the display.
- 📱 Lux Lite is a classic application with flexible brightness curve settings and the ability to create profiles for different locations.
- 🌗 Auto Brightness Settings is a simple tool that allows you to fine-tune the sensor sensitivity and minimum/maximum brightness thresholds.
- 🔆 Brightness Slider & Auto – widget for fast mode change and forced inclusion of maximum illumination bypassing system restrictions.
In addition, on newer versions of Android and HyperOS, the system can aggressively unload such applications from memory, which requires that the application be allowed to work in the background and remove the power saving restrictions in the battery settings.
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For stable operation of brightness control applications, add them to the list “No restrictions” in the settings section “Battery → Energy Saving of Applications”.
Comparison of display modes and their effect on brightness
The perception of brightness is influenced not only by the physical backlight, but also by the color profile chosen. Xiaomi smartphones have several display modes available, each of which interprets colors and contrast differently, switching between them can subjectively make the screen brighter or darker, even if the value in the suites remains unchanged.
Settings → Screen → Color scheme is usually available in the “Saturated”, “Standard”, “Classic” and “Extended” mode. The “Saturated” mode (Vivid) is often used by default and upgrades the saturation of colors, which visually makes the picture more vivid and contrasting. However, this mode can distort the color reproduction. The “Standard” or “Classic” mode (sRGB) provides more accurate colors, but the image may appear duller.
| Regime. | Description | Impact on brightness | Recommendation |
|---|---|---|---|
| Saturated | Increased saturation and contrast | Visually brighter. | For multimedia and gaming |
| Standard. | Balance between saturation and realism | Average. | For everyday use |
| Classical. | Precise color reproduction of sRGB | Visually dimmer | To work with photos |
| Expanded | Professional calibration | Depends on the profile. | For experts |
Also worth mentioning is the AI Image Improvements feature (or similar name depending on the MIUI version), which dynamically increases contrast and saturation in certain applications, such as a gallery or video player, and enabling this feature can create the illusion of increasing the overall brightness of the interface.
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Selecting a color profile “Saturated” is the easiest way to make the screen visually brighter without changing the backlight settings.
Solving problems with the proximity sensor and protective film
Often, the light sensor in Xiaomi smartphones is located at the top of the screen, next to the speaker, or built into the display itself (underscreen sensor). If there is an obstacle in the way of light, the system “thinks” that it is in the dark, and reduces the brightness to a minimum.
The first thing to look at is the protective glass or the film, and the poor accessories can be opaque or just too thick in the sensor area, and this is especially true for models with subscreen sensors that require perfect transparency of the material, take the film and see if the screen reacts to light, and the sensor can simply get dirty with grease or dust, which is solved by wiping the top edge with microfiber.
Another common problem is proximity sensor conflict: while talking or accidentally closing the top of the screen with your palm, the system blocks touch buttons and often lowers brightness. If you notice that the screen goes out or dims for no reason, check the proximity sensor calibration through an engineering menu (code ##6484## → “Proximity sensor”). Incorrect calibration can lead to false positives that affect backlight control.
⚠️ Attention: When replacing the display in service centers, it is often forgotten to re-adhere the sealing gum or correctly install the sensor plume, which leads to constant problems with autobrightness after repair.
☑️ Physical factors check
Hidden developer settings and additional functions
For advanced users who aren't afraid to experiment, there are hidden settings in the Developer Menu, and you can activate this section by quickly clicking 7 times on the build number in the About Phone section, and you can find parameters inside the developer menu that affect display behavior, although there is usually no direct brightness adjustment.
However, there is an option called Color Space Mode or settings related to HDR. Enabling broad color coverage can change brightness mapping algorithms, and it’s also worth paying attention to the Adaptive Backlight feature in the context of Always-On Display. If this function doesn’t work properly, it can interfere with the main brightness control system.
In some cases, resetting all settings to factory settings helps, but with data retention (although a full reset is more reliable), this removes the cache of system services that may have "remembered" the wrong light values, and before that, it is recommended to make a full backup through Mi Cloud or locally, since autobrightness setting is a process that the system "learns" for a long time, and reset will return it to the original, "clean" learning state.
If none of the software methods worked, and the screen still does not reach a comfortable brightness level even at maximum, there may be a degradation of the backlight (especially on older LCD screens) or a malfunction of the power controller.