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In fact, the problem is the way my phone. When it is silent, the LED does not work. Otherwise, when the "interruption " are allowed (possible only vibrate or more), the LED work. The problem is that I want my phone remains silent and the LED appears anyway.
Do you have stamina mode on?
No... The problem is with the update. I found the solution. Silent mode prevents " interruptions " and thus the LED to activate. You have to activate the vibrate mode, prohibit any interruption except that of the LED Manager (app store). This is Google 's fault , not the phone ... Thanks!
Awesome, I'm glad you figured it out
Check this out
http://talk.sonymobile.com/t5/Software-Updates/Lollipop-New-Features/m-p/955490#U955490
Is it an issue which affect more users? Is there any way to fix it? Thank you
On silent mode doent work. working fine on vibration or loud mode. i hope we get android 5.2 . on it working and on silent mode.
At present the LED will not notify you in silent mode but is been looked into and may well be available in future releases
I'm also facing the same issue 
Any fixes so far ?? kitkat was far more better than lollipop in many ways !!