Why does the background light stay on permanently and running battery down?

[iMore Question]

Background light is staying on and wont turn off, consequently battery is being run down very quickly

 

[kch50428]

Tapping the power button doesn't do anything? You'll need to get that fixed... You can go to settings and set an auto lock time...

 

[Just_Me_D]

It would also be helpful to know what device you're referring to.