Hi this is my first problem with my phone, the thing is when i took upp my phone out of my pocket unlocked the screen then i got XPERIA logo and then it went black then it lighted up again with SONY logo then XPERIA and then color effect after that i putted it back in my pocket and when i went to my room and took my phone up and pressed lock screen i noticed nothing happens but when i look carefully i can see that screen responds fine but only background light is not responding so screen is completely dark so either i could of accidentely pressed the background light button thats in notify area when putting it back in my pocket so i would like a quick method on how to switch it back on when screen is really dark 😕
background light works normal as well 
