Public bug reported:

When the system enters sleep mode, Xorg appears to freeze.  When the
system wakes back up, there is just a black screen.  There is no
apparent way to get the system back once this happens.  Interestingly,
the system does not appear to be completely frozen, in that it is still
possible to SSH into the machine in this state.  However, the local
console is completely unusable.  Note that this is on a very new Intel
Broadwell-U notebook using integrated video.

I am running Ubuntu 15.10 Wily x86-64.  My Xorg version is:
1:7.7+7ubuntu4.

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: xorg 1:7.7+7ubuntu4
ProcVersionSignature: Ubuntu 4.1.0-3.3-generic 4.1.3
Uname: Linux 4.1.0-3-generic x86_64
ApportVersion: 2.18-0ubuntu5
Architecture: amd64
Date: Tue Aug  4 21:03:56 2015
InstallationDate: Installed on 2015-05-28 (68 days ago)
InstallationMedia: Xubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422.1)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug wily

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https://bugs.launchpad.net/bugs/1481539

Title:
  X freezes when screen enters sleep mode

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