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[Chris Halse Rogers <raof@xxxxxxxxxx>]

I think I've got a workaround locally, but I'd like to check that the
bug I'm working around locally is the same bug as here.  The gnome-
desktop3 packages in https://edge.launchpad.net/~raof/+archive/aubergine
contain a patch to wait 50msec during the modesetting to ensure that the
previous configuration changes have been applied before trying to apply
the new config.  For me, this seems to reliably work around problems
when disabling LVDS with an external display.

This is not a proper fix, but will point towards where to look in the
kernel for a proper fix.

Could you please test these packages (libgnome-desktop-3-2 version
3.2.0-0ubuntu4.2~raof1) and check whether you can reproduce this bug
with them?  You'll need to restart after installing the update, to
ensure that gnome-settings-daemon is using the right library.

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-control-center in Ubuntu.
https://bugs.launchpad.net/bugs/828623

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

Status in GNOME Control Center:
  Incomplete
Status in “gnome-control-center” package in Ubuntu:
  Triaged
Status in “gnome-control-center” source package in Oneiric:
  Triaged
Status in Fedora:
  Unknown

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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