LightDM crashes/hangs during resume from suspend

Description: Ubuntu 15.10
Release: 15.10

lightdm:
  Installed: 1.16.7-0ubuntu1
  Candidate: 1.16.7-0ubuntu1
  Version table:
 *** 1.16.7-0ubuntu1 0
        500 http://us.archive.ubuntu.com/ubuntu/ wily-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     1.16.4-0ubuntu1 0
        500 http://us.archive.ubuntu.com/ubuntu/ wily/main amd64 Packages

Expected: To be able to resume from suspend and be able to reliably use my desktop.

What happened: Sometimes the UI is completely nonresponsive to keystrokes or mouse input after opening the lid of the computer. I am forced to cut the power.

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: lightdm 1.16.7-0ubuntu1
ProcVersionSignature: Ubuntu 4.2.0-27.32-generic 4.2.8-ckt1
Uname: Linux 4.2.0-27-generic x86_64
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
CurrentDesktop: Unity
Date: Tue Feb 9 18:20:50 2016
InstallationDate: Installed on 2014-11-28 (438 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
SourcePackage: lightdm
UpgradeStatus: Upgraded to wily on 2016-01-14 (26 days ago)