Currently I've been running without issues with the following
configuration in /etc/init/lightdm.conf since September 2013.

[...]
start on ((filesystem
           and runlevel [!06]
           and started dbus
           and plymouth-ready
           and stopped udevtrigger)  # <- one line fix
          or runlevel PREVLEVEL=S)
[...]

My configuration is:
Ubuntu 12.04 64bit
Intel SSD 335
Nvidia GTS 650 with NVIDIA drivers.
lightdm version 1.2.3-0ubuntu2.4

Additionally, dependencies on the following were not helping to solve the 
problem:
graphics-device-added PRIMARY_DEVICE_FOR_DISPLAY=1 - this event is not fired on 
my machine
graphics-device-added - this event is fired too early - possibly on vesafb load 
- ligthdm crashes and the fallback mode kicks in.
drm-device-added PRIMARY_DEVICE_FOR_DISPLAY=1 - is not fired on my machine

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to lightdm in Ubuntu.
https://bugs.launchpad.net/bugs/969489

Title:
  lightdm tries (and fails) to start too early?

Status in Upstart:
  Confirmed
Status in “lightdm” package in Ubuntu:
  Triaged

Bug description:
  Sometimes lightdm comes up fine.  Other times it appears to fail.
  x-0.log shows it tried to load 'nv' (rather than 'nvidia' which is
  what actually exists).  When I then log into console and 'start
  lightdm', it comes up fine (on :1).

  I've not had it come up ok today, so I don't know if, when it comes up
  fine, it starts on :0.  No idea if the lightdm.conf needs a change to
  'start on'clause, or if this is just a case of a bad shipped config
  file (for module 'nv').

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: lightdm 1.1.9-0ubuntu1
  ProcVersionSignature: Ubuntu 3.2.0-20.33-generic 3.2.12
  Uname: Linux 3.2.0-20-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.0-0ubuntu1
  Architecture: amd64
  Date: Fri Mar 30 13:40:27 2012
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 
(20120323)
  ProcEnviron:
   TERM=xterm
   PATH=(custom, user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: lightdm
  UpgradeStatus: No upgrade log present (probably fresh install)

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