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[Dave Russell <828623@xxxxxxxxxxxxxxxxxx>]

A workaround is to run the following commands:

xrandr --size 1920x1200 --output LVDS1 --off --output HDMI1 --mode 1920x1200
compiz --replace

Still, it really should work via the gui...

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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” package in Ubuntu:
  Confirmed

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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