Please make sure you have updated to the latest BIOS firmware for Dell
M4800 (probably release date 9/16/2014) . I just did and have not seen
this problem since then.

** Changed in: nvidia-graphics-drivers-331 (Ubuntu)
       Status: Triaged => Incomplete

** Summary changed:

- DPMS support broken, fails to wake up the monitor after putting it to sleep
+ [Dell M4800] DPMS support broken, fails to wake up the monitor after putting 
it to sleep

** Changed in: nvidia-graphics-drivers-331-updates (Ubuntu)
       Status: Triaged => Incomplete

** Also affects: xserver-xorg-video-nouveau (Ubuntu)
   Importance: Undecided
       Status: New

** Bug watch added: LibreOffice Bugzilla #85459
   https://www.libreoffice.org/bugzilla/show_bug.cgi?id=85459

** Also affects: nouveau via
   https://www.libreoffice.org/bugzilla/show_bug.cgi?id=85459
   Importance: Unknown
       Status: Unknown

** Changed in: xserver-xorg-video-nouveau (Ubuntu)
       Status: New => Incomplete

** Also affects: dell
   Importance: Undecided
       Status: New

** Also affects: hwe-next
   Importance: Undecided
       Status: New

** Also affects: oem-priority
   Importance: Undecided
       Status: New

** Changed in: dell
       Status: New => Incomplete

** Changed in: hwe-next
       Status: New => Incomplete

** Changed in: oem-priority
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1268151

Title:
  [Dell M4800] DPMS support broken, fails to wake up the monitor after
  putting it to sleep

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