lightdm starts with blank screen

[Sezer Yalcin]

laptop boots fine but with blank screen.
ctrl+alt+f1 switches to terminal 1 with text login

Then doing trl+alt+f7 switches back to login screen with graphics and has no issues.
Login and everything else works fine afterwards.

Some mentioned SSD may cause this and I experimented with some delays i lightdm.conf but didn't change anything.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: lightdm 1.10.3-0ubuntu2
ProcVersionSignature: Ubuntu 3.13.0-43.72-generic 3.13.11.11
Uname: Linux 3.13.0-43-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.6
Architecture: amd64
CurrentDesktop: Unity
Date: Tue Dec 16 15:31:24 2014
InstallationDate: Installed on 2012-11-11 (765 days ago)
InstallationMedia: Xubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120817.3)
LightdmConfig:
 [SeatDefaults]
 greeter-session=unity-greeter
 user-session=ubuntu
SourcePackage: lightdm
UpgradeStatus: Upgraded to trusty on 2014-10-17 (59 days ago)
mtime.conffile..etc.init.lightdm.conf: 2014-12-16T13:06:43.188021

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.