Connecting smartphone to pc if the phone is locked

Question

I read that i can use USB Debugging and adb to copy my phone data even if its is locked .But my Ubuntu -14.10 does not detect the smartphone unless i unlock it.Any suggestions ?

Tried both Usb 2.0 and 3.0

Answer 1

Try this. There is option in the developer options of settings that says "Stay awake".

Also you can keep it unlocked by settings>security>Screen lock>none