When a sound is suddenly lost during an important video conference, it is annoying for anyone, especially when it happens on a device that should provide seamless communication, such as the Xiaomi Redmi, the problem can be the banal inattention when connecting a headset or the deeper system conflicts of the MIUI shell.
Modern smartphones have a complex audio stream management structure where each playback channel is adjusted separately. Often users forget that media volume, bell and alarm are different parameters, and a failure in one of them creates the illusion of complete audio failure. Zoom adds another layer of complexity due to its specific noise reduction algorithms.
Before you panic and bring your device to the service, it is worth conducting a thorough diagnostic of the software part, and in most cases, the reason lies in privacy settings or accidentally switching audio output to external devices, and below we will discuss all possible scenarios and ways to eliminate them.
Basic verification of hardware switches and connections
The first thing to rule out is the physical connection of external devices. Android often prioritizes Bluetooth headsets or wired headphones, even if they are in another room or discharged. If Bluetooth is active, sound can go to the device forgotten in the bag, leaving the phone speakers silent.
Check the side of your Redmi's body. Some models feature mechanical switches or touch zones for quick access to functions. It's also worth making sure the 3.5mm headphone jack or USB Type-C port is clean of dust that can close contacts and simulate accessories.
- 🎧 Turn off Bluetooth in the notification curtain and check if the sound appears.
- 🔌 Remove wired headphones if they are connected, even if they are not in use.
- 🔊 Increase the volume with buttons on the case during a test call in Zoom.
⚠️ Note: If you use a case with thick sides, it can cover the bottom hole of the main speaker, making the sound quiet and indistinct.
Configure system resolutions and access to the microphone
MIUI is famous for its aggressive security policies that can block apps from accessing audio devices without the user's knowledge.If Zoom doesn't have permission to use the microphone, not only will you not hear others, but they won't hear you either.
To check, go to Settings menu, then select Apps and find All Apps. In the list, search Zoom and click on App Permission. Make sure the switch opposite to Microphone is activated. It is also recommended to check the resolution for Record Sound, which can be hidden in the additional menu.
Sometimes, a complete application permission reset helps, and it won't delete your data, but it will return all access settings to the default state, and then, when you first start, Zoom will again request the necessary permissions, and you can control the process.
☑️ Access rights verification
Note that new versions of Android have temporary permissions. If you choose the “Only during use” option, make sure that the app is not rolled into the background, otherwise access to the microphone will be automatically blocked by the system for the sake of energy savings.
Audio and volume management in MIUI
Unlike iOS, Android splits volume control into several independent channels, and Xiaomi does this in particular detail. When you press volume buttons, look at the gear icon or the three dots under the slider -- click on them to open the extended menu.
Here you'll see the individual regulators for Media, Call, Alarm, and Notifications. Zoom uses Media to play the voice of the interlocutors and Microphone to capture your voice. If the media slider is down, the speakers are silent, even if the overall volume is twisted to maximum.
| Type of sound | What is responsible for? | The impact on Zoom |
|---|---|---|
| Media | Videos, music, games | Volume of interlocutors |
| Call. | Cellular service | It doesn't (usually) affect |
| Alarm clock | System signals | No influence. |
| Notifications | SMS, messengers | The sound of the incoming call |
There's also the Absolute Volume feature in the developer menu or the advanced Bluetooth settings. Turning it on synchronizes the volume of the phone and the connected headset. If the sound in the headphones is quiet, try changing the status of this setting.
How to enter the developer menu?
Conflicts with the “Do Not Disturb” regime and energy saving
Do Not Disturb (DND) mode can block not only notifications, but also the audio of applications that the system considers secondary. In the settings of this mode, check the exception list. If Zoom is absent, its audible signals can be silenced.
Aggressive energy saving is a scourge of the MIUI shell. The system can freeze the background processes of the application, which leads to a break in the audio stream. Go to the settings of the Zoom application → Activity Control and select No restrictions. This will allow the application to work in the background without interruption.
- 🔋 Turn off the "Energy Saving" mode during important negotiations.
- 🚫 Check the schedule of the “Do Not Disturb” mode in the “Sound and Vibration” section».
- 🛡️ Add Zoom to the list of “Safe Apps” in the Security app».
⚠️ Warning: Memory cleanup (Close All Applications) may interrupt Zoom audio service.It is better to leave the application running in the background with the correct power saving settings.
It's also worth checking if the In-Pack mode is activated.If the proximity sensor is contaminated or covered with a tight case, the phone can think it's in the bag and turn off the speaker, switching to silence or vibration mode.
Specific settings within the Zoom app
The Zoom app itself has its own audio settings that overlap the system settings. Go to the Settings inside the app (the gear or profile icon) and select the Conference section. There's the Connect via Wi-Fi or Cellular switch -- make sure it's active.
An important parameter is "Disable Loading." If it's on, you'll walk into the conference with your microphone off, and check the Dynamic section in the sound settings during the call (the button in the corner of the video screen), where you can select a specific output device if there are more than one.
The path to resetting Zoom settings:
Settings → General → Reset Zoom settings (bottom of the list)Sometimes reinstalling the app helps, but before you do that, make sure to save important contacts. When you re-install, the system will ask for permissions again, which often solves the problem of suspended audio drivers.
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Use the test call in Zoom settings before an important meeting. There's a "Check speaker and microphone" button in the conference menu that allows you to record and play the test piece.
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Settings inside the Zoom app take precedence over the phone’s system settings, so checks should always start with them.
Additional functions of sound and their influence
Xiaomi smartphones have audio enhancement features like Mi Sound Enhancer or Sound Improvement that can conflict with Zoom's noise-cancellation algorithms, causing echoes or the voice to disappear completely. Try turning off all audio enhancements in the Sound and Vibration section.
Also check if the Mono-Audio mode is enabled in the special features. If the Advanced Settings → Special Options option is activated by Mono-Audio, this can change the nature of the sound, making it unusual or quiet on one of the channels.
Remember to clean the cache. Accumulated temporary files may contain errors. In the Zoom app menu, click Clear Data → Clear Cache. This is a safe operation that will not affect your account.
When to contact the service center
If the software methods didn't work, maybe the problem is the hardware. The failure of the main speaker or microphone plume is a common cause after falls or moisture. Even if the music is playing, the speaker for calls (auditory) can be separate and faulty.
Notice the behavior of the sound: if it wheezes, interrupts, or is accompanied by a static crack, it is a sure sign of hardware failure.
⚠️ Warning: Attempts to disassemble the phone yourself to clean the speaker can lead to damage to moisture-protective membranes and loss of warranty.
If you suspect a malfunction, the best solution is to diagnose the malfunctioning node, and they use test modes (engineering menus) to check each audio channel separately and pinpoint the faulty node.