Comment 0 for bug 1610476

Pretty simple & not unknown.
Test case:
Optimus laptop
14.04.5 install or 14.04.x upgraded to lts-xenial HWE stack
Install nvidia drivers, reboot
Upon reboot the greeter screen will be blank though the bell will be heard.
Wait 300+ sec. for idle time out, then wake machine up
At that point the display is enabled & will be such for the life of the login session.

Solutions:
1. patch ubuntu-drivers-common to use modesetting for intel (very poor choice I'd think
2. reduce the idle time out in unity-greeter.gschema.xml to 3-4 secs. ( another poor choice but could inadvertently help out.
3. fix this issue ( likely not possible
4. pre-warn users/upgraders in a 14.04.5 release/upgrade note
5. provide a patched lts ubuntu-drivers-common only for 14.04.5

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubuntu-drivers-common 1:0.2.91.11
ProcVersionSignature: Ubuntu 4.4.0-31.50~14.04.1-generic 4.4.13
Uname: Linux 4.4.0-31-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.14.1-0ubuntu3.21
Architecture: amd64
CurrentDesktop: Unity
Date: Fri Aug 5 19:04:35 2016
InstallationDate: Installed on 2016-08-05 (0 days ago)
InstallationMedia: Ubuntu 14.04.5 LTS "Trusty Tahr" - Release amd64 (20160803)
SourcePackage: ubuntu-drivers-common
UpgradeStatus: No upgrade log present (probably fresh install)