Why the alarm clock on Xiaomi does not work: all the reasons and ways to fix it

You set an alarm on Xiaomi, Redmi or POCO, But it didn't work at the appointed time? This is a problem that many brand device owners know -- surveys show that up to 28 percent of users are affected by it, and it can be caused by software failures and hardware constraints. In this article, we will analyze all possible scenarios, from banal errors in settings to hidden energy saving functions that prevent the alarm clock from performing its task.

Xiaomi’s smartphone features aggressive battery optimization, which often blocks the background of apps, including the standard Watch app. We analyzed user reviews, technical documentation and test results on Xiaomi 13 Pro, Redmi Note 12 and other models. POCO X5, Important: Some solutions require changes in system settings, so watch out for warnings in the article.

1. Checking the basic alarm clock settings

Before you look for complex causes, make sure your alarm is set correctly. Errors in settings for time, sound, or repetition days are the most common reason for alarm clock silence. Open the Clock app and go to the Alarm tab.

Pay attention to the following parameters:

• ⏰ Time of operation – check that the alarm is set at the correct time (check the format) 12/24 hourly).
• 🔊 Sound signal – if you select “No sound” or a melody with zero volume, the alarm will act as a vibration (which can also be turned off).
• 📅 Repeat Days – If the alarm clock is set to “Mn-Pt” only, it won’t work on the weekend.
• 🔔 The name of the alarm clock – sometimes users confuse several alarm clocks (for example, “worker” and “morning” alarm clocks»).

In the models with MIUI 14+ You've added a smart alarm that automatically adjusts wake-up time based on sleep phase, and if it's activated, the alarm clock can go off 10 to 30 minutes earlier or later than the set time. → Smart alarm and move the slider to the off position..

Energy conservation and background activity

The main reason why the alarm doesn’t work on Xiaomi is because of aggressive battery optimization. MIUI Automatically restricts the background of apps, including the Watch, to extend battery life, causing the alarm to simply “fall asleep” with the phone.

To correct this, follow the following steps:

1. Go to Settings → Applications → Application Management.
2. Find the Clock app** and open its settings.
3. Select Battery Limitation and set the value No Limits.
4. Go back and enable AutoRun (allows the app to start when the phone is restarted).

On some firmware (e.g, MIUI Global 13.0.6) may require additional action: add the Watch to the list of protected applications:

1. Go to Settings → Battery and Performance → Battery Management.
2. Select the Apps Choice and find the “Clock”.
3. Activate Protect (or Lock Cleanup on older versions).

Add "Clock" to battery optimization exceptions|

Insert auto-start for the "Clock" app"|

Turn off the Smart Alarm (if not necessary)|

Check that your phone doesn’t go into deep sleep at night.-->

A critical error on some models (e.g. Redmi Note 10 Pro): Even after optimisation is turned off, the alarm may not work if the phone is down to 15% or less, in which case the system forcibly shuts down all background processes. To avoid this, charge the phone before bedtime or connect it to a charger at night.

3. Problems with system time and date

If your Xiaomi has lost system time (for example, due to automatic switching to winter/summer time or network failure), the alarm may go off at the wrong time or not work at all.

1. Open Settings → Additional settings → Date and time.
2. Make sure that options are included: ✅ Autodetermining date and time ✅ Time zone autodetermination

If the time is lost, turn off automatic determination, set the correct time manually, then turn on auto-reference again.

On devices with MIUI 12.5 and later, there is a hidden function of synchronizing time with Xiaomi servers. If the alarm goes off with a delay of 1-2 minutes, try manually synchronizing the time:

adb shell settings put global auto_time 1


adb shell settings put global auto_time_zone 1

These commands will force the time data to be updated, and they will require the debugging on to be done. USB and a computer with a computer installed ADB.

4. Conflicts with third-party applications

Some applications can block the standard alarm clock, and most often, the culprits are:

• 🔋 Battery optimizers (e.g. Greenify, AccuBattery) – they force the system processes to “sleep down.

To identify the conflict:

1. Put your phone in safe mode (press the power button → “Safe Mode”).
2. Set your alarm clock 1-2 minutes ahead and see if it works.
3. If the alarm goes off, it's a problem in one of the third-party apps, and delete them one by one, starting with the optimizers until you find the culprit.

On models POCO F4 Xiaomi 12T Users have reported a conflict with the Google Clock app, and if you use it instead of a standard alarm clock, try it:

• Update Google Clock to the latest version.
• Clear the app cache in Settings → Apps.
• Disable battery optimization for Google Clock (similar to instructions for the Watch).

5. Hardware problems: speaker, vibration, buttons

If the alarm goes off (a visible notification) but you can’t hear it or feel the vibration, the problem may be in the hardware:

On devices with AMOLED-The Xiaomi 13 Ultra screens have a feature called “Always On Display» (AOD). If it's on, the phone may not go out of sleep when the alarm goes off. AOD overnight:

1. Go to Settings → Screen → Always On Display
2. Select a schedule and set a shutdown. AOD at night (for example, from 23:00 to 7:00).

💡

If the alarm doesn’t work only on certain days (such as Mondays), check the settings Do not disturb in Settings. → Sound and vibration, maybe that day has an exception.

6. firmware failures and system updates

Firmware errors are a common cause of alarm clock problems, especially after major updates MIUI. For example, in the version MIUI 13.0.4 for Redmi Note 11 was a bug that caused the alarm to go off an hour later than the set time:

• 🔄 Update to the latest version: Go to Settings → The phone. → System Update. Click Check Updates and Install available packages.
• 🔧 Clear the cache of the "Clock" app»**:

Reset the settings of the Clock app** (if cleaning the cache didn’t help):

1. In the same app settings, select Reset settings.
2. Confirm the action - it will return all alarm clocks to factory parameters.

If the problem has occurred after the update, and there is no new firmware version, try to roll back to the previous version.

1. Download the necessary firmware version from the official Xiaomi website (Download section) → MIUI ROM).
2. Go to Settings → About Phone → System Update → Click on the three dots in the upper right corner → Select a firmware file.
3. Install the downloaded file and restart the phone.

💡

Before you roll back the firmware, back up the data! Use Settings → Additional settings → Backup and reset or third-party tools like Mi Mover.

On certain devices (e.g, POCO X3 Pro) after the update, the permissions for system applications are lost:

adb shell pm grant com.android.deskclock android.permission.SCHEDULE_EXACT_ALARM


adb shell pm grant com.android.deskclock android.permission.USE_EXACT_ALARM

These commands give the Clock app back the right to the exact alarm clock, and without it, the system can ignore the set time.

7. Features of Xiaomi, Redmi and POCO

Some of the devices in the series have unique alarm clock problems, and we've collected data from popular models.

On devices with a Snapdragon processor (for example, POCO X5 Pro) alarm may fail due to conflict with Dynamic RAM Expansion (Virtual RAM) to check it out:

1. Go to Settings. → Additional settings → Advanced memory settings.
2. Turn off the extension option RAM (Reduce the amount of virtual memory to 1 GB).
3. Restart your phone and check the alarm clock.

💡

If you have Xiaomi with a MediaTek processor (e.g. Redmi) 10C), Update the audio drivers through Settings → The phone. → Updating the system → Packet updates. That'll solve the problem of silent alarm clocks.

Extreme measures: dumping and alternative solutions

If none of these methods worked, radical measures remain:

If the standard alarm fails to work, install an alternative from Google Play:

• 🔔 Alarmy – An alarm clock with wake-up tasks (e.g. scanning) QR-code).
• 🎵 Sleep as Android – a smart alarm clock with sleep analysis.
• ⏰ Timely – Cloud Alarm (Synced between Devices).

On models with a locked bootloader (such as the global versions of Xiaomi for Europe), resetting may not help due to manufacturer restrictions.

• Contact the Xiaomi service center with a complaint about a hardware defect.
• Unlock the bootloader and reflash the phone (risk of loss of warranty!).

💡

If the alarm doesn’t work in certain places (such as at home), the problem may be interference from other devices, and try turning off Wi-Fi or Bluetooth overnight, which sometimes interfere with the alarm clock.

Last tip: if you often encounter a problem, buy a mechanical alarm clock or a Mi smartwatch Band/Xiaomi Watch: They sync to the smartphone and duplicate the signal, which increases the reliability of the awakening.

FAQ: Frequent questions about the alarm clock on Xiaomi