The alarm clock on Xiaomi does not work: a full analysis of the causes and solutions

You set an alarm on Xiaomi in the evening and slept over in the morning because it didn't work? This problem is familiar to many owners of smartphones of the brand - from the budget Redmi Note to the flagship Mi 13. 80% of cases are to blame for software problems, but sometimes the root of the evil lies in hardware features or even factory defects. In this article, we will examine all possible reasons why the alarm on Xiaomi may not work, from banal user errors to hidden bugs of MIUI firmware.

It’s important to understand that Xiaomi’s alarm system is closely related to energy saving, background processes, and even battery health. For example, on models with a Snapdragon 8 Gen 2 processor (such as the Xiaomi 13 Pro), the alarm clock may not work due to aggressive MIUI optimization for gaming chipsets. And on older devices like the Redmi 4X, the problem often lies in a worn-out battery that shuts down when charged low. We won’t limit ourselves to general tips – each section contains specific instructions for your model and version of MIUI.

1. Battery optimization blocks alarm clock

The most common reason is automatic power optimization, which kills background processes, including alarm clocks. In MIUI, this feature is more aggressive than in pure Android, especially on devices with low RAM (2-4 GB), the system can “forget” about the alarm clock if the smartphone was lying without movement for a long time or was overloaded with background tasks.

How to check:

• 🔋 Open the Settings. → Battery and productivity → Optimizing the battery.
• 🔍 In the list of applications, find the Watch (or Clock in the global firmware).
• ❌ If next to the application is a tick Optimized - remove it!
• ⚙️ For reliability, add the Watch app to Secure Applications (Settings section) → Annexes → Permits → Auto-start).

On some models (e.g. POCO F3 or Redmi K40), even after optimisation is disabled, the alarm clock may not work due to a bug in MIUI 13/14.

1. Install Activity Launcher from Google Play.
2. Find com.android.deskclock (standard watch).
3. Start the AlarmService service manually.

2. Incorrect time and date settings

If a smartphone has a time or date that is lost (for example, after a battery change or reset), the alarm clock may go off at the wrong time or not work at all, especially for devices without a GPS module (for example, Redmi A1) that synchronize time over the network.

How to fix it:

• 🕒 Go to Settings. → Additionally. → Date and time.
• 🔄 Enable options: Autodetermining date and time (over the network) Autodetermining time zone
• ⚠️ If time is constantly straying, check the module. RTC (real-time) in the service centre.

⚠️ Note: On some firmware (for example, MIUI EU) If you've turned on the auto-clock alarm clock, you can manually set the correct time and turn off the automatic timing.

3. Conflict with the Do Not Disturb or Sleep regime

Do Not Disturb (DND) or the MIUI’s Sleepy feature can block all notifications, including alarms, and the setting can be triggered automatically, such as on a schedule or when connecting to Wi-Fi at home.

How to check:

1. Open Settings → Sound and vibration → Do not disturb.
2. Check the schedule and exceptions: 🔔 In the Schedule section, turn off automatic activation. 🛡️ In the exceptions add alarm clocks and clocks.

Settings → Lock screen → Relaxed sleep

4. Failure of the standard application “Clock”

Xiaomi Watch is known for its bugs, especially in global firmware. For example, after upgrading to MIUI 14, many Redmi Note 12 users have experienced alarm clocks that go off an hour earlier or later. Sometimes it helps to simply reinstall the app, but in MIUI it can not be removed by standard means.

Resetting instructions:

If the reset doesn’t work, try setting an alternative alarm clock:

• 🔔 Alarmy – wakes up to completely shut down the task (for example, scan). QR-code).
• 🎵 Sleep as Android – Integrates with sleep trackers.
• ⏰ Google Clock is more reliable than standard, but requires Google Services.

⚠️ Note: On some models (Redmi) 8A, Redmi 9C) The alarm clocks are not working due to restrictions. MIUI In this case, only the rollback of the firmware or the installation of custom (for example, Pixel Experience) will help).

5. Problems with battery or charging

If the alarm doesn’t work and the phone is down to 0%, the reason is obvious, but even at 20 to 30% charge, some Xiaomi models (especially those with a worn-out battery) can automatically shut down at night to save power for the morning switch on, as for devices older than 2-3 years:

• 📉 Redmi 5/5A/6/6A — Problems with the power controller.
• 🔋 POCO F1 — It can be turned off when the charge is below 15% even when the switched off state.
• ⚡ Mi A2/A3 — deep discharge bug due to lack of fast charging.

How to check the status of the battery:

1. Enter the dialer code ##4636##.
2. Go to Battery Information and see Health Level.
3. If the battery is below 80%, it is time to change the battery.

Provisional decision:

• 🔌 Charge your phone overnight (even if it’s bad for the battery, but otherwise the alarm won’t work).
• 🔄 Turn on Plane Mode before bedtime – this will reduce energy consumption.
• ⚡ Use Lean Mode in Settings → Battery (but not at the same time as alarm clock!).

💡

If the phone turns off at night, but in the morning it shows 10-20% of the charge, this is a sign of a malfunction of the power controller.

Hardware malfunctions: speaker, vibration, buttons

If the alarm goes off (for example, the screen lights up) but you can't hear it, the problem may be the speaker, the vibrator, or even the plume of the volume button.

• 🔊 Silent sound: Contamination speaker or membrane damage (relevant to Redmi) 7/8 fall-out).
• 📳 Vibration does not work: Vibrator failure (often on the POCO M3 posthumidity).
• 🔕 Volume settings are lost: Oxidation of button contacts (for example, on Mi) 9T).

Diagnosis:

1. Check the sound of the alarm clock through the headphones – if everything works in them, the problem is in the dynamics.
2. Run the vibration test: type in the dial ##0*### (on some models).
3. Try changing the volume of the alarm clock with buttons – if there is no reaction, clean or change the buttons.

Cost of repair:

7 Conflict with MIUI shell or firmware

Some versions of MIUI have critical alarm bugs, such as:

• 🐞 MIUI 12.0.3-12.0.8: alarm clocks are triggered 1 hour early due to time zone error.
• 🔄 MIUI 13.0.4 for Redmi Note 10 Pro: Alarm clocks do not work in Performance mode.
• 📱 MIUI 14 (Global): Accidental AlarmManager service failures.

Decisions:

1. Update the firmware: Go to Settings → About Phone → System Update.
2. Reverse to stable version: If the bug appeared after the update, download the previous firmware from the official website and run through Recovery.
3. Install custom firmware: For example, Pixel Experience or LineageOS (requires unlocking the bootloader).

For advanced users, a command to reset the alarm service (requires ADB):

adb shell cmd jobscheduler run -f com.android.deskclock 999

💡

If the alarm clock doesn’t work after the MIUI update, try resetting the Clock app first, rather than rolling back the firmware immediately.

8 External factors: temperature, humidity, covers

Few people know, but the alarm clock on Xiaomi may not work due to overheating or hypothermia of the phone.

• ❄️ If the phone was lying on a cold windowsill at night (below) +5°C), the battery may temporarily shut down.
• 🔥 If the smartphone overheated under the pillow or in the case, the thermal protection works, which blocks all background processes.
• 💧 Moisture (even condensate) can cause a short circuit in the food chain.

How to avoid:

• 📱 Do not put your phone in sealed cases (especially silicone cases) at night).
• 🌡️ Avoid extreme temperatures (optimally: +10°C +35°C).
• 🚫 Do not leave your smartphone near heat sources (battery, heater).

⚠️ Attention: On models with AMOLED-screens (Mi 11, Redmi) K50) Prolonged exposure to cold can cause permanent damage to the matrix – even after returning to a warm room!

FAQ: Frequent questions about alarm clocks on Xiaomi