I have a Galaxy S4 and just upgraded to Lollipop. Now my lock screen gives me about 2-3 seconds before it goes dark. I cant for the life of me find the setting to increase that time. Help!
Try Settings>Lock Screen>Lock automatically which will bring up a window with time delay options. Click on your choice of from Immediately to 30 minutes.
same problem... mine was set to five seconds, i selected 15 and it still goes dark within 2-3 seconds. In my case, this happens when my phone is sitting somewhere then wakes up for a notification. i can barely read the notice and it goes dark.