Previous articleThe sound of notifications on Xiaomi: how to return calls and messages

The situation of missing notifications on a Xiaomi smartphone is one of the most annoying problems for users of the MIUI shell and HyperOS. You can expect an important message from a customer or a call from a relative, but the device is treacherously silent, even though the screen lights up. This is not just a small bug, but often the result of aggressive energy saving policies or a complex hierarchy of sound settings implemented by developers.

In most cases, the reason is not a hardware breakdown of the speaker, but a software conflict. Xiaomi can automatically “sleep” messengers, turn off system sounds after an update, or switch the profile to “Do Not Disturb” mode on schedule. Understanding how to prioritize processes in the background will help you quickly diagnose and fix the malfunction without visiting the service center.

In this article, we will look at all possible scenarios, from simple key locks to complex system failures, and it will take only a few minutes to restore functionality if you consistently check the key configuration parameters discussed below.

Basic volume checks and physical switches

Before you get into the wilds of system settings, you need to eliminate elementary errors. Often users accidentally knock down the media settings, thinking that they are adjusting the call. On Redmi and Poco smartphones, there is a separation of volume levels, and the quiet sound of notifications can simply be twisted to zero while the media files play normally.

Press one of the volume buttons on the device body. When the setting scale appears, press the tripod or the setting button next to the slider. You will see an extended menu where you can independently adjust the media, alarm, call and notifications. Make sure that the notification slider is not in the leftmost position.

⚠️ WARNING: If you're using wireless headphones or connected to a Bluetooth speaker, the sound of notifications can be broadcasted on them even if they're lying in your bag.Switch off Bluetooth temporarily to check if sound appears via the smartphone speaker.

It's also worth checking whether no sound or vibration mode is activated. In some regions, there's a physical switch on the side of the devices that can be shifted by accident. In the software interface, silence status is usually displayed at the top of the screen or in the quick-set curtain.

Do Not Disturb and Sleep Schedules

One of the most common reasons why notifications are lost is the activated Do Not Disturb mode, which, unlike a simple silent mode, completely blocks audio and vibration signals, and can also turn off the screen when calls are received. MIUI This mode has its own, independent settings.

Go to Settings → Sound and Vibration → Don’t disturb. Here you need to check a few critical parameters. First, make sure the activation switch is off. Second, check the “Planned” section. Often users set the start and end times of silence, forgetting about it, and wonder why the phone is silent during these hours.

Special attention should be paid to exception settings. Even if the Do Not Disturb mode is active, you can allow sound for selected contacts or recalls. However, for standard application notifications (WhatsApp, Telegram, SMS), there are general lock rules. If the schedule says "Daily from 23:00 to 07:00", then at this time notifications will arrive, but without sound.

Notification settings for specific applications

If only one or more apps lost audio, the problem lies in their individual settings. Android allows you to flexibly manage notification channels for each software installed. Perhaps after updating the application or the operating system itself, the channel priority was changed to No Sound.

To fix this, go to Settings → Notifications and Status bar → Notification Management. Find a problem app (like Viber or Gmail) on the list. Inside, you'll see a list of notification categories. Make sure the Allow Notifications switch is active and the sound display is selected for important categories (messages, calls) rather than the sound display.

Also check if there is a "No Sound" check at the top of the app's settings menu. Sometimes system updates reset those permissions and the app starts running in the background with limited functionality. For instant messengers, it's critical that notifications are given high priority.

The Effect of Battery Optimization on Background Processes

Aggressive battery optimization is a MIUI feature that often becomes the enemy of normal notifications. The system seeks to maximize battery life, so it can kill messenger processes if they are not in use for a long time. As a result, when a new message arrives, the application has not yet started to play the sound.

To solve this problem, add important apps to the exception list. Go to Settings → Battery and Performance (or simply “Battery”). Find “Apps Saving Charge” or similar. Find the right one (like Telegram) in the installed program list and select the “No Limits” strategy, which will prevent the system from forcibly closing the application.

If the app is not authorized to auto-start, it may not start after the phone has restarted, and notifications will not arrive until you manually open the program.

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Use built-in search in your settings. Type the word “Battery” or app name in the settings search bar to find the menu item you want faster, as the names may differ from one version of MIUI.

System sounds and choice of theme design

A non-obvious but common cause of the lack of sound is a featured theme failure. Custom themes downloaded from Themes may contain corrupted audio files or conflict with system settings. If you recently changed theme, try going back to standard.

In addition, there is a separate item in the audio settings, “Touch Sound and Vibration.” If these system sounds are turned off globally, some applications may not behave correctly. Check the Settings → Sound and Vibration → Additional. Make sure that the “Lock Sound” and “Tap Sound” switch are active, although they are not directly related to notifications, their disabling sometimes affects the overall audio context of the system.

There is also a problem with choosing a tune: If you set a custom ringtone in a format that the system cannot read (like a corrupted file or an unsupported codec), the sound simply won't play back.

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Third-party themes are a common cause of interface and sound bugs, and if problems start after a change in design, resetting the theme to a standard solves the problem 90 percent of the time.

Comparative table of causes and solutions

To make it easier to diagnose, we've put the basic scenarios together in a single table, which will help you quickly map your symptoms and find a solution without having to read the whole text.

Resetting sound settings and rebooting services

If none of the above methods worked, there may have been a failure in the system process responsible for audio, in which case forced reboot of services or reset of audio settings helps. Simple device reboot (Switch off → Reboot) also often solves the problem by clearing the temporary cache of the system.

A more radical but effective method is to reset all your phone settings. Importantly, this step will delete all your data, so make sure to back up. If you're not ready for a full reset, you can try clearing the Settings or Sound app cache if that option is available on your firmware version through the Apps menu.

Network resets can help in some cases, as audio codecs can conflict with communication drivers. Go to Settings → Connection and Sharing → Reset Wi-Fi, mobile networks and Bluetooth. This will not delete personal files, but will return network settings to factory values.

⚠️ Warning: Before performing a full reset, make sure you remember the password from your Mi Account and Google account. Once reset, your phone will require you to enter them for activation, and without passwords, you will not be able to use the device.

In conclusion, it is worth noting that software failures on Xiaomi are temporary. Regular firmware updates to the current version of MIUI or HyperOS often contain corrections for audio subsystem errors.