Modern Xiaomi and Redmi smartphones, which run on MIUI shells or the new HyperOS, have a complex sound management system that often confuses users. When a device is silent at the most inopportune moment, it can lead to the missing of an important call or message from the bank. The problem with the lack of audible notifications often lies not in the breakdown of speakers, but in the confusing settings of software profiles.
Owners of Xiaomi and Redmi devices often find that the default system can be configured to silent mode or Do Not Disturb mode. This is especially true after a firmware update, when some parameters are reset or energy saving algorithms are changed. Understanding the logic of how audio profiles work is key to solving this problem.
In this article, we will take a look at all the possible causes of your gadget’s silence, from basic switches in the notification curtain to deep customizations of specific applications, learn to distinguish between system limitations and software bugs, and learn how to return a voice to your smartphone.
Basic verification of sound profiles and operating modes
The first thing to do if the notifications are missing is to check the active sound profile. There are several basic modes in the MIUI and HyperOS shell: Sound, No Sound, and Do Not Disturb, and switching between them often happens by accident when you remove the phone from your pocket or press volume buttons.
To quickly check, swipe down the notification curtain from top to bottom. Find a bell icon or volume slider. Make sure the Notification Sound slider (often marked by an envelope or bell icon) isn't moved to zero. Sometimes the system separates the volume of the multimedia and system sounds, so check must be careful.
⚠️ Attention: Do not disturb the mode" (DND) It completely blocks the sound and vibration for all incoming contacts except those added to the exceptions.
If the sliders are OK, check the side button (if any) or volume button settings. Pressing the volume button often triggers a pop-up menu where you can quickly select a profile. Make sure you select Sound mode rather than Vibration mode.
Also worth noting is the Pocket Mode feature, which can block sound if the proximity sensor is closed, and although this affects calls more often, it affects system alerts in some versions of firmware.
Deep audio setting in the settings menu
If you don't have a quick setup, you need to go to the deep menu of the system. Follow the Settings → Sound and vibration. There are many parameters hidden here that control the behavior of your Xiaomi audio interface.
In this section, look for the item "Notification Sound." When you click on it, you'll see a list of available tunes. It's important to choose the standard system sound, not the silence. Sometimes users accidentally set the "empty" audio file as the default signal.
- 🔊 Check the volume of the alarm and notifications separately from the media.
- 🔇 Make sure the No Sound function is turned off in the advanced sound settings.
- 📳 Check the vibration settings: sometimes the sound is there, but it is too quiet and the user relies on the vibration, which can also be turned off.
Special attention should be paid to the section "Additional audio settings" where you can activate the function "Mono-sound" or "Sound enhancement", which in rare cases conflict with the device drivers. Try to disable the audio enhancements Mi Sound to eliminate software conflict.
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If you use third-party themes, try switching to the standard "Classic" theme. Third-party themes often contain errors in the configuration of sound profiles, which can cause the notifications to disappear.
Don’t forget to check the sound settings for SIM-If you have two cards, the message notifications (SMS) can be linked to a particular SIM card, and for one of them the sound may be turned off.
Customization of sound signals for specific applications
The most common reason why notifications from WhatsApp, Telegram or Viber don’t come is because of the individual settings of the apps themselves. Android allows you to control the sound for each application separately, override system settings.
To adjust the sound for a particular messenger, go to Settings → Notifications and Status bar → Notification Management. Find the desired app (like WhatsApp) in the list and click on it. Here you will see the Allow Notifications switch – it should be active.
Then you click on the notification type, such as "Messages" or "Group Chats." You will see a detailed menu where you can select a tune. Make sure that you tick "Sound" and select a specific melody, not "No Sound".
☑️ Checking the application settings
You can customize the sound for private messages separately from calls or broadcasts. Check all available categories within the app.
⚠️ Warning: If you don’t see the desired notification category in the list, click “Other Notifications” or three dots in the corner of the screen to reveal the full list of app notification channels.
It's also worth checking if Quiet Notifications are enabled, and in this mode, notifications come in, appear in the curtain, but don't make sounds or vibrate until you unlock the screen.
Do Not Disturb and Schedules
Do Not Disturb (DND) is a powerful tool that often becomes the unnoticed culprit of silence. Unlike a simple silent mode, DND has its own rules for filtering incoming events.
Check if this mode is activated on schedule. Go to Settings → Sound and vibration → Do not disturb. This can be set to automatically turn on, for example, from 23:00 to 07:00 or on weekends.
| Parameter | Description of the impact of sound | Recommended value |
|---|---|---|
| Schedule | Automatically shuts down the sound at a given time | Turned off (or configured exceptions) |
| Calls. | Determines who can get through. | From everyone (if you need to hear them all) |
| Notifications | Blocks sounds from apps | Permission. |
| Repeated calls | Misses the second call in 3 minutes | Included (for emergencies) |
Pay special attention to the "Exceptions" section. This is where you can set up your favorite contacts, which will be heard even in silence mode. If you need to only have alarm clocks running, make sure that the appropriate item is activated.
Sometimes, Do Not Disturb is activated automatically when you run certain applications (such as games or video players) or when you flip your phone down. Check your automation settings under "Special Features" or "Smart Help."
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Do Not Disturb mode takes precedence over normal audio settings, and if it is on, the system's notification volume sliders may not work until it is turned off.
Impact of energy saving and background activity
Aggressive energy saving policies in Xiaomi and Redmi smartphones often cause apps to fall asleep and stop making sounds until they are opened by the user, killing background processes to save battery life.
To fix this, you need to set up autostart and work in the background. Go to Settings → Apps → All applications, find the problem application and select "Energy Saving." Set the value "No restrictions."
- 🔋 Enable Auto-Run for messengers so that they run along with the system.
- 🔒 Lock the application in memory: open the menu of running applications, click on the lock icon next to the desired application.
- 📶 Check the battery settings: Settings → Battery, make sure that no Ultra Battery Saver is enabled, which blocks background activity.
Also worth checking is the Memory Cleanup settings. If you use the Cleanup button (cross or broomstick) often, it can close the background processes, causing notifications to not arrive on time. Add important applications to the cleaner exception list.
Why does the sound only appear after the app is opened?
In some cases, resetting battery optimization settings helps, and to do this, you can find the item “Reset optimization settings” in the developer menu (if it is enabled), but you should do this with caution, since this will affect all applications.
Diagnostics of hardware problems and resetting settings
If all the software settings are checked, but the sound never came, maybe the problem is hardware or a deep system failure. First, rule out mechanical damage: check if the speaker is flooded with water, if there is dirt in the speaker grid.
Try playing music or video, if there's sound in the media files and there's no notifications, it's a software problem, if there's no sound anywhere, maybe the bottom speaker or the plume has failed, and then only the service center will help.
As a last resort, software diagnostics can reset all settings, and it's important that resetting your settings won't delete your personal files (photos, contacts), but will return all system settings to factory values. → Advanced settings → Recovery and discharge → Resetting settings.
⚠️ Warning: Before performing a reset, be sure to back up your data to Mi Cloud or your computer to avoid accidentally losing important information.
Also worth checking is whether you have custom firmware or a modified bootloader installed, and unofficial versions of the software may contain bugs in audio drivers, in which case it is recommended to return to the official global firmware through Recovery mode.
If, even after resetting and checking the official firmware, there is no sound, most likely a speaker replacement or repair (motherboard) is required.