Volume keys setup on Xiaomi: from basic features to hidden features

The volume keys on Xiaomi smartphones are not just physical buttons to adjust the sound. Over the years, MIUI has been developing dozens of hidden features, from fast camera start to control the flashlight when it is turned off. However, many users face problems: buttons do not respond, work “once” or reset after an update. In this article, we will examine all the ways of settings, from standard options in the menu to manually editing configuration files for experienced users.

Xiaomi’s peculiarity is that even within a single line (e.g., Redmi Note 12 vs POCO X5), key function may differ due to MIUI versions or hardware limitations. We tested the instructions on models from Xiaomi 11T Pro to the budget Redmi A2 to cover the maximum number of scenarios. If your model is older than 2019, check the hardware malfunction section — it describes the typical “diseases” of mechanical buttons.

Standard Volume settings in MIUI

The basic sound management functions are hidden in the Settings → Sound and vibration menu.

• 🔊 Separate volume control for media, calls and alarm clocks (included in Additional settings) → Volume adjustment by buttons).
• 🔔 Silent mode when holding the key "Loudness down" (does not work on all models).
• 🎵 Adaptive sound – Automatic volume adjustment to ambient noise (requires) MIUI 13+).

Starting with MIUI 14, the option Separate Media and Call Management was introduced in firmware, which allows one key to adjust the volume of music and the other to adjust the volume of notifications.

1. Go to Settings → Sound and vibration → Additional settings.
2. Select Volume Adjustment with the buttons.
3. Activate the Separate Control switch.

An important nuance: on some models (for example, POCO F4), separate management works only after disabling MIUI Optimization in the developer settings. If the option is inactive, check the firmware version - on MIUI 12.5 and below this feature may not be available.

Reassign volume keys through developer settings

For advanced users, Xiaomi has provided hidden button reassignment options to activate them:

1. Turn on Developer Mode: Go to Settings → About Phone and click on MIUI Version 7 times.
2. Go back to the main settings menu, find the Developer section.
3. Scroll to the Enter block and select Volume button functions.

Options are available here:

• 📸 Starting the camera (holding any volume key).
• 🔦 Turning on the flashlight (works even on the phone turned off).
• 🔇 Switching sound profiles (sound sound)ignal/soundless).
• 🔄 Rewinding tracks (double tap for next/previous track).

Enable the developer mode

Make a backup copy of settings

Check out the MIUI version (some options only work on MIUI 13+)

Turn off optimization MIUI (if required)-->

On models with an infrared port (such as the Xiaomi 12 Pro), the developer menu may include the option to use volume keys to control household appliances through the remote, a feature that is experimental and does not work with all devices.

Solving problems with broken volume buttons

If the volume keys don't respond or don't work properly, the reasons can be both software and hardware.

For hardware diagnostics:

1. Run a hardware test: dial ##4636## in the phone application and select Equipment Testing.
2. Check the response of the buttons in the Volume button menu. If the test shows an error, the problem is the hardware.

⚠️ Attention: On smartphones with protection IP53/IP68 (for example, Xiaomi 13 Ultra) self-disassembly will result in loss of water resistance.

Use of third-party applications for advanced management

If standard MIUI features aren’t enough, install one of the specialized applications:

• 🛠️ Button Mapper – allows you to reassign any buttons, including volume keys, to launch applications, gestures or system actions. ROOT fully functional.
• 🎛️ Volume Styles – customization of the volume panel with the addition of fast switches (Wi-Fi, Bluetooth, etc.).
• 🔧 Tasker – to create complex scenarios (e.g., “at double pressing up the volume, turn on the navigator").

Example of settings in Button Mapper:

1. Open the application and grant ADB permissions (instructions will appear when you first start).
2. Choose Volume Up or Volume Down.
3. Assign action: launch the application, click simulation, change system settings.
4. Save your profile and restart your phone.

💡

If the buttons stopped working after installing Button Mapper, check the settings. ADB Reliability in the developer menu. Sometimes you need to manually confirm the permission of the application through the adb shell pm grant command. flar2.homebutton android.permission.WRITE_SECURE_SETTINGS

For POCO-firmware POCO Launcher: Some Button Mapper features may conflict with system gestures. POCO launcher.

Features of customization on custom firmware (LineageOS, Pixel Experience)

On informal firmware, the logic of the volume keys can be radically different: for example, LineageOS does not have separate media and calls management by default, and in Pixel Experience, the volume buttons by default control only media sound.

To bring back the usual behavior:

1. Install the Magisk MIUI Volume Button Control module (available in the Magisk repository).
2. Or edit /system/usr/keylayout/Generic.kl file manually (requires ROOT).

An example of editing Generic.kl to reassign the Volume Up key to start the camera:

key 115   VOLUME_UP          WAKE_DROPPED


key 115   CAMERA             WAKE

⚠️ Note: Incorrect editing of files in /system This can lead to bootloop. Always back up the boot partition before making changes.

💡

On custom firmware, volume keys are often used to control Kernel Adiutor (CPU/GPU adjustment) or enable Fast Charge (holding both buttons when charging).

Hardware modifications: button replacement and repair

If the diagnosis showed a physical malfunction, consider repair options:

• 🔧 Replacement of the button module - on Redmi-models is ~300-800 ^ "Flagships" (Xiaomi) 13) before 1500 ruble.
• 🧲 Cleaning contacts – helps with oxidation (use isopropyl alcohol 90%+).
• 🔄 Replacement of the plume – is important for models with a removable back cover (Redmi Note 8 Pro and older).

To replace the buttons on Xiaomi will need:

• Plastic blades for disassembly.
• Thermophen (for models with adhesive screen mounting).
• Suction cup for the display.
• Multimeter for contact checks.

The following is a step-by-step instruction for the Redmi Note 10 Pro:

1. Turn off the phone and remove it. SIM-map.
2. Heat the edge of the screen with a hairdryer (temperature ~60°C) and tuck it with a spatula.
3. Disconnect the battery plume, then the plume of the button module.
4. Replace the module and assemble the phone in reverse order.

FAQ: Frequent questions about setting volume keys