Hi
Actually this topic is still undecided even through it was so important for me.
Because, this computer is my workstation and sometime I don't use it several 
days.
And some day I'd like to login to check somthing but the screen never came back.
Ctrl+Alt+F1 or other combination didn't response till reboot the system.
Or I'd like to get a communication via TeamViewer but this screen is same real 
one as black.
So last 2-3 months I was very busy to overcome problem.
Because OS reinstallation should be last solution which called plan Z.

So
Yesterday I typed following commands than the problem fixed.
     dm-tool lock
     light-locker-command
     light-locker &
     light-locker-command -l
     lxlock
     sudo reboot

After booting up, the system has been back to normal.

Thanks
Ertan

** Changed in: ubuntu
       Status: Incomplete => Confirmed

** Changed in: ubuntu
       Status: Confirmed => Fix Committed

** Changed in: ubuntu
     Assignee: (unassigned) => Ertan Günay (f-info-3)

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https://bugs.launchpad.net/bugs/1500925

Title:
  Ubuntu 15.10 Idle freezing/screen not waking up

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