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[Andreas Sonnenbichler <813566@xxxxxxxxxxxxxxxxxx>]

I am not sure if this is exactly the same bug, but it really sounds so.

My setup: Notebook in docking station, two external monitors (HDMI 1680x1050, VGA 120x1024).
When LightDM starts HDMI monitor reports "Wrong Sync error", VGA monitor turns black, Notebook display shows correctly. This way I always have to open the closed notebook sitting in the docking station, login, and continue to work when Unity/Gnome comes up.

Behaviour does NOT differ if notebook is plugged into docking station
after booting or booting after plugging in docking station.

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https://bugs.launchpad.net/bugs/813566

Title:
  Greeter not displayed correctly on multi monitor setup

Status in Light Display Manager:
  Triaged
Status in Unity Greeter:
  Triaged
Status in “lightdm” package in Ubuntu:
  Triaged
Status in “unity-greeter” package in Ubuntu:
  Triaged
Status in “lightdm” source package in Precise:
  Triaged
Status in “unity-greeter” source package in Precise:
  Triaged

Bug description:
  Upon booting with an external monitor (1920x1200 resolution) hooked up
  to my laptop (1920x1080 resolution), the external display mirrors the
  laptop display, but garbles the screen (see screenshot).

  Using GDM, the external display is treated as extra screen space
  (greeter appears on laptop screen only), and is not garbled

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: lightdm 0.4.3-0ubuntu1
  ProcVersionSignature: Ubuntu 3.0.0-5.6-generic 3.0.0-rc7
  Uname: Linux 3.0.0-5-generic x86_64
  Architecture: amd64
  Date: Wed Jul 20 07:52:42 2011
  InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Release Candidate amd64 (20100419.1)
  ProcEnviron:
   PATH=(custom, user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: lightdm
  UpgradeStatus: Upgraded to oneiric on 2011-07-13 (6 days ago)

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