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[Dave Russell <828623@xxxxxxxxxxxxxxxxxx>]

I've just done some further testing. The behaviour varies depending on
whether I use the displayport or vga connections.

Laptop Panel + VGA = With both on, the picture is perfect and I can move
windows from one to the other.

NO Laptop Panel, Just VGA = I am able to disable the onboard laptop
screen and just have the external monitor, however the external display
is corrupted.

Displayport connectivity behaves as described previously mentioned, i.e.
still completely blank when attempting to disable laptop screen, but
fine if both are allowed to display.

I have also verified that the same behaviour is exhibited under Fedora
16 Alpha LiveCD. Will raise upstream and Fedora Bugs.

** Also affects: gnome-control-center (Fedora)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/828623

Title:
  gnome control centre does not allow you to disable the laptop screen
  while leaving an external connected screen working

Status in GNOME Control Center:
  New
Status in “gnome-control-center” package in Ubuntu:
  Confirmed
Status in “gnome-control-center” package in Fedora:
  New

Bug description:
  Lenovo T500 with displayport has a 1920x1200 monitor attached, I use
  the displayport in a similar way to a docking station in that I attach
  the monitor with a displayport to dvi cable, and then expect to be
  able to switch off the laptops internal display, only leaving the
  external monitor working.

  Screen detection works fine, mirrored screen works fine, but disabling
  the internal display and activating the external display just leads to
  the screen going black until the timeout has been reached, whereupon
  it reverts to its previous setting.

  This is a fully updated oneiric install

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: gnome-control-center 1:3.1.4-0ubuntu5
  ProcVersionSignature: Ubuntu 3.0.0-8.11-generic 3.0.1
  Uname: Linux 3.0.0-8-generic x86_64
  Architecture: amd64
  Date: Thu Aug 18 10:35:59 2011
  EcryptfsInUse: Yes
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha amd64 (20110803.1)
  ProcEnviron:
   LANGUAGE=en_GB:en
   PATH=(custom, user)
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  SourcePackage: gnome-control-center
  UpgradeStatus: No upgrade log present (probably fresh install)

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