Samsung Flash Notification Not Working? Real Fix (One UI 6/7/8)
You turned the feature on - it shows 'Enabled' - but it never fires. Or it worked for a week and then One UI silently killed it after an update. You're not alone. Samsung's aggressive battery optimisation and Adaptive Battery break notification-based flash alerts in ways that native settings alone can't prevent.
Symptoms you might be seeing
- The flash fires once, then never again after a few hours or overnight.
- Alerts work right after install but stop after a phone restart.
- The screen lights up but the camera flash (torch) never blinks.
- Some apps trigger the flash and others are silently ignored.
Why this happens on Samsung
Samsung's One UI is aggressive about saving battery. It puts background apps to sleep, revokes the notification-listener connection, and can kill the foreground service that drives the flash. When that happens the app still looks enabled in settings while it has quietly stopped running. The fixes below stop One UI from putting Tilin to sleep.
4-step fix for One UI 6, 7, and 8
Re-toggle Flash Notification in Accessibility
On One UI 6: Settings → Accessibility → Advanced Settings → Flash Notification → Camera flash / Screen flash. Turn it OFF, wait 5 seconds, turn it back ON. On One UI 7 or 8, the path moved to Settings → Accessibility → Hearing enhancements → Flash notification. Re-toggling forces the system to re-register the listener.
Disable Adaptive Battery and add your app to Never-sleeping apps
Go to Settings → Battery → Background usage limits. Disable 'Adaptive battery'. Then tap 'Never sleeping apps' → + and add the app whose notifications should trigger the flash. Samsung automatically puts unfamiliar apps to sleep - this is the most common silent killer.
Re-grant Notification Access
Samsung quietly revokes notification access on major One UI updates. Go to Settings → Notifications → Advanced settings → Notification access. Find your alert app, revoke access, confirm, then re-grant. This refreshes the binding between the listener service and the OS.
Prevent Samsung from disabling listeners after reboot
After every reboot Samsung's auto-optimisation may pause notification listeners. Open the alert app right after a reboot so Android marks it as 'recently used', or pin it: hold the app in the recents screen and tap the lock icon (One UI 7+). Some devices also need 'Auto-start' enabled in Settings → Apps → [app] → Battery.
One UI settings to check
Battery: never sleeping apps
Open Settings > Battery > Background usage limits and add Tilin to 'Never sleeping apps'. Make sure it is not in 'Sleeping' or 'Deep sleeping' apps.
Allow background activity
Open Settings > Apps > Tilin > Battery and set it to 'Unrestricted', then enable 'Allow background activity'.
Notification categories
Open Settings > Notifications and confirm notifications are allowed for the apps you want Tilin to watch. One UI can mute whole notification categories, which hides them from Tilin.
Frequently asked questions
Why does the flash stop working after a few hours?
One UI moved Tilin into a sleeping-apps bucket to save battery. Adding Tilin to 'Never sleeping apps' and setting its battery usage to 'Unrestricted' keeps the alert service alive.
Does Tilin need the camera permission to flash?
No. Tilin uses Android's torch API, which does not require the camera permission. Tilin never requests camera access.
Why do alerts stop after I restart my phone?
The background service has to restart after a reboot. Grant the battery-optimization exemption and re-open Tilin once after restarting so the service relaunches reliably.
Some apps trigger the flash but others do not. Why?
Each app you want to watch must have a rule enabled in Tilin, and that app's notifications must be allowed in One UI. Check both if a specific app is being missed.
Will these settings drain my battery?
The impact is small. Tilin runs a single lightweight foreground service and only acts when a matching notification arrives. Keeping it unrestricted is what makes alerts reliable.
Still not working?
Tilin survives Samsung's optimisations - by design.
Tilin runs as a foreground service with a boot receiver. It shows you it's running, and tells you when it isn't. No silent failures.
- No CAMERA permission - ever. No data harvesting.
- One-time $4.99 unlock. No subscription.
- Foreground-service architecture that Samsung can't silently kill.
Related
Compatible with Android 9+ · Samsung Galaxy S, A, and Z series · One UI 6, 7, 8