tl;dr If an encrypted phone is decrypted while charging, the battery LED will keeps on, even after disconnecting charging cable/change setting/soft reboot.

Device: Samsung Galaxy S4 LTE (GT-I9505) running CM13 snapshot 20160820

I have wiped the system+data+cache partitions of my S4 and flashed CM13 rom. Default setting is to have battery LED on while charging. I disabled this in Settings. No LED on during charging. That's what I want.

Then I set up device encryption (Settings -> Security -> Encrypt Phone). Afterwards, I disconnected the charger, reboot, and enter my password to decrypt the phone. Then I connected the charger again. Still no LED on. (Normal)

Then I reboot the device again. Before decrypting the phone I connected it to charger. The battery LED is now on with green colour. I guess it's due to my settings being encrypted, and the default of "LED on while charging" is applied.

But when I decrypted my phone while charging, the LED keeps on even after the lock screen is shown, or when it is unlocked to launcher. I disconnected the charger, putting the device in non-charging status. The battery LED is still on with green light without charging.

I tried repeatedly (dis)connecting charger, turning LED on/off in Settings, and even soft reboot. The charging LED still shines on. The only way I managed to get the LED off is to shutdown/regular reboot the device.

Further experiment shows that this problem appears only when I press enter (after entering password) to decrypt my phone while charging. The phone is normal (LED off) if I enter my password while charging, disconnect the charger, and press enter to decrypt the phone.

Question: Is there any way to decrypt the phone while charging, and still keep the battery LED off?

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Browse other questions tagged or ask your own question.