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[Bryce Harrington <828623@xxxxxxxxxxxxxxxxxx>]

I think I'm able to reproduce more or less this same bug.

For me, it occurs only when I use gnome-control-center to switch from
VGA-off-and-LVDS-on directly to VGA-on-and-LVDS-off.  If I start with
both displays on, and disable LVDS, it works fine.  If I use xrandr, it
works fine.  See bug #737891 (set as a dupe of this one now) for
details.

For diagnosing, I used 'xrandr --verbose', which indicates some
difference in how the crtcs are being mapped.

I also enabled graphics debugging (sudo xdiagnose, first checkbox,
apply, reboot), then collected dmesg before and after doing the switch,
once with gnome-control-center, and once with xrandr.  I will attach
both of these files.  (The logs fill with pipe A underrun messages which
I believe to be irrelevant so have filtered those out for clarity.)

** Attachment added: "Broken case - using gnome-control-center"
   https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/828623/+attachment/2467494/+files/dmesg.broke.clean.txt

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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:
  Unknown
Status in “gnome-control-center” package in Ubuntu:
  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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