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[wooglin280 <1507346@xxxxxxxxxxxxxxxxxx>]

This seems like the same problem I am having. If I allow the display to
go to sleep, I cannot get it to come back on. I can change to terminal
with Ctrl+Alt+F1 and  restart lightdm or just reboot. In the meantime,
until this bug is resolved, I have disabled turning the display off to
save power.

The display does still go to sleep at the login screen, however, it will
come back on from there.

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https://bugs.launchpad.net/bugs/1507346

Title:
  Back light off after sleep mode

Status in xorg package in Ubuntu:
  Incomplete

Bug description:
  Hi all, 
  I would like to report that the back light of the display doesn't come back on after the computer has been in sleep or display off mode.   It initially came back on to allow me to unlock the account / log back in, then it turned off and stayed like that.  The windows are displaying correctly, so using the desk lamp as light source I could log out and back in again, to no avail.  Re-start and all is happy, but power save again, and darkness surrounds you. 

  My laptop is a Dell Latitude E6540 with the standard Intel 4600 graphics. 
  Please let me know what other details you may require

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: xorg 1:7.7+7ubuntu4
  ProcVersionSignature: Ubuntu 4.2.0-11.13-generic 4.2.1
  Uname: Linux 4.2.0-11-generic x86_64
  ApportVersion: 2.18.1-0ubuntu1
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Sun Oct 18 19:16:14 2015
  InstallationDate: Installed on 2015-10-11 (7 days ago)
  InstallationMedia: Xubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150924)
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)

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