If the screen doesn't light up after you receive notifications on the Xiaomi 11 Lite 5G NE, you can refer to the following methods to troubleshoot the issue:
1. Ensure that your phone's operating system is up-to-date. Software updates often include bug fixes, security patches, and improvements that can address software-level issues;
2. Check if you have set the notification effect by going to [Settings] >> [Always-on display & Lock screen] >> [Notification effect] >> select the notification effect;
3. If you restrict the app’s notification permissions, the screen will not light up after you receive notifications. Check the notification permissions by going to [Settings] >> [Apps] >> [Permissions] >> [Permissions] >> [Notifications] >> check and adjust the apps’ notification permissions;
4. Verify whether you installed third-party apps, such as theme, font, security/optimizer, battery manager, or system launcher. Unlike the MIUI built-in features, these apps may not be compatible with the operating system or user interface and may cause notification issues. In this case, please uninstall the above-mentioned third-party apps;
5. If the issue persists, you can perform the factory reset. Remember to back up important data before performing it.
We hope the above information is helpful. If the issue still occurs, we hope you could submit user feedback by going to [Settings] >> [Services & feedback], and wait for the future updates.