Modern Xiaomi smartphones are equipped with high-quality matrices, but standard brightness settings do not always satisfy users who are in direct sunlight. The maximum level provided by the manufacturer may not be enough for comfortable reading or navigation on the street.
Access to these settings allows you to control the hardware settings of the display, which are usually hidden from the average user, and changing these values can dramatically change the perception of the image, making it more rich and bright, but it is worthwhile to understand that interference with the system software requires caution and follow the instructions accurately.
Before making modifications, you need to be aware of the potential risks: Incorrectly changing the backlight parameters can lead to overheating of the device or degradation of the backlight LEDs. This article details safe methods of brightening using proven codes and diagnostic tools.
What is the engineering menu and its capabilities
The Engineering Menu is a special diagnostic interface designed to test hardware components in a smartphone by service centers. In the case of Redmi and Poco devices powered by MediaTek or Qualcomm processors, this section allows you to adjust signal amplification, sensor calibration and, importantly for us, display backlight settings.
The user gets access to the deep settings of the screen drivers, bypassing the standard shell restrictions MIUI You can change the minimum and maximum brightness thresholds, and you can also adjust the color temperature. AMOLED-Matrices where factory calibration may be too conservative.
Importantly, the menu interface may differ depending on the Android version and the type of processor installed.A wider range of display settings is available on MediaTek chips compared to Snapdragon, where some partitions can be blocked by the manufacturer.
⚠️ Attention: Making changes to the engineering menu may lead to improper display operation or the appearance of artifacts.
Preparation of the device for diagnosis and entry into mode
To successfully enter the hidden partition, you need to prepare your smartphone. Make sure that the battery level is at least 50%, as changing the backlight settings can temporarily increase power consumption. It is also advisable to disable third-party applications that can block system calls or block the screen.
There are several ways to activate the engineering mode. The most common method is to use a special system. USSD-For most Xiaomi devices with MediaTek processors, the combination ##3646633## works. Enter it in the dialer and the transition should be made automatically.
If the standard code doesn't work, your firmware may have limitations, so you can use the Engineer Mode app. MTK, It emulates the system call and opens the desired partition. For owners of devices on Snapdragon access may be limited, and you will need to use it. ADB-commands through a computer.
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If the code doesn't work, try entering it quickly, without pause. Some models require pre-enabled USB debugging from the Developer menu.
Instructions to increase brightness through the engineering menu
Once you've successfully logged in, you'll need to find the tab that controls the display. In MediaTek, it's usually the Hardware Testing section, and then the Display subsection, or LCM. This is where the sliders that control the intensity of the light output are.
Find Backlight or LED. Here you'll see a scale where you can set minimum and maximum brightness levels. The standard maximum is often limited to 2047 or 4095 (depending on the bit size of the controller), and increasing that value can have the desired effect, but it needs to be done Step-by-step.
☑️ Check before changing the settings
Change the settings smoothly. For example, if the current maximum is 200 units, try to increase it to 220, press Set and evaluate the result. A sharp jump to maximum values can disable the backlight power circuit. After setting up, remember to press the Save or Apply button to make the changes take effect.
Configuring display and color reproduction parameters
In addition to the overall brightness, the engineering menu allows you to fine-tune color profiles, so in the CMM Test or Color section, you can adjust the saturation of the red, green and blue channels (RGB), which helps to compensate for the yellowness or blueness that is characteristic of some batches of matrixes.
Special attention should be paid to gamma correction. Changing gamma affects how the semitone is displayed. If you make the image too contrasting, details can disappear in the shadows or lights. The optimal solution is to choose a preset profile, for example, sRGB or Natural, if this option is available on your menu.
For users who read frequently from their phones, setting the color temperature is helpful, shifting to warmer shades reduces eye strain in the evening, while colder tones make the picture clearer during the day, and all changes are applied in real time, allowing you to immediately evaluate the result.
| Parameter | Description | Recommended value | Impact on the device |
|---|---|---|---|
| Min Brightness | Minimum illumination level | 5-10 units | Comfort in the dark |
| Max Brightness | Maximum power of LED | Not above 2500. | Readability in the sun |
| Gamma Curve | Brightness curve | 2.2 (Standard) | Naturality of flowers |
| Color Temp | Color temperature | 6500K | White balance |
⚠️ Note: The values in the engineering menu may vary from model to model, and do not enter values that exceed factory limits by more than a factor of one. 15-20%.
Alternative methods of brightening without root rights
If it seems too risky to mess with the engineering menu, there are more secure software options. Google Play apps like Super Brightness or Screen Brightness Controller can software-driven "re-definition" the system slider, and they create a layer on top of the screen that blocks some of the light, allowing you to twist the system brightness 100% and adjust it separately.
Another method is the use of ADB-And you can send a command, if you connect the phone to the PC, that forcefully changes the brightness of the system configuration file:
adb shell settings put system screen_brightness 255Also worth checking is the settings in Advanced Settings -> Sunlight (if available). Turning on the "Brightness" mode causes the phone to ignore some thermal control restrictions in bright ambient light, giving peak values for a short time.
Secret codes for checking the display
Possible risks and troubleshooting
The main risk of increasing brightness is heat release. LED-When operating at the limiting power, diodes emit a significant amount of heat that is transferred to the matrix and the battery. Prolonged operation in this mode can lead to detachment of the plumes or battery bloating.
If the screen flickered or bars appeared after the changes, you should immediately return the original values. In the engineering menu, there is often a Default or Reset button that returns the factory settings. If the phone stopped responding to touch due to brightness, try rebooting the device by holding the power button (sometimes you need to press the volume down).
In rare cases, incorrect settings can lead to a "brickle" of the GUI. If the phone turns on but the image is incorrect, resetting to factory settings (Wipe Data) via Recovery Menu will help, which will delete all user data, but return the system files to their original state.
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It is safer to use third-party filter applications than to change the hardware limits in the engineering menu, as this does not affect the wear of the matrix.