Originally Posted by I am dumb
This started when I messed around with my boot animation and created a nandroid back up. And now I can't lock my screen. Sent from my SM-T210 using XDA Free mobile app
you are dumb,
you need to make sure you have bootsamsung.qmg and bootsamsungloop.qmg in /system/media and their permissions
are 644. on stock samsung rom messing with those file messes up sleep/suspend function.