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[Bryce Harrington <840974@xxxxxxxxxxxxxxxxxx>]

Thanks for attaching the dmesg output with debugging turned on.  Looking
through it I do notice this bit which looks possibly complicit in this
issue:

[  515.630872] [drm:intel_prepare_page_flip], preparing flip with no unpin work?
[  515.683339] [drm:intel_wait_for_vblank], vblank wait timed out
[  515.683439] [drm:drm_crtc_helper_set_config], 
[  515.683445] [drm:drm_crtc_helper_set_config], [CRTC:4] [NOFB]
[  515.683457] [drm:drm_crtc_helper_set_config], [CONNECTOR:5:LVDS-1] to [CRTC:3]
[  515.683463] [drm:drm_crtc_helper_set_config], crtc changed, full mode switch
[  515.683468] [drm:drm_crtc_helper_set_config], [CONNECTOR:11:VGA-1] to [NOCRTC]
[  515.692792] [drm:intel_crtc_cursor_set], 
[  515.699776] [drm:i915_get_vblank_timestamp], crtc 1 is disabled
[  515.716486] [drm:i915_get_vblank_timestamp], crtc 1 is disabled
[  515.733167] [drm:i915_get_vblank_timestamp], crtc 1 is disabled
...

Those crtc 1 disabled messages go on for almost 20 seconds, so I presume
this sequence corresponds to when your screen was blanked.  Looks like
at that point the LVDS was mapped to crtc 3; perhaps X was expecting it
on crtc 1 instead and started issuing the warnings when it didn't find
it there.

Would you be willing to do a quick check that this same behavior occurs
in Ubuntu Precise? It should be sufficient to boot a Live USB session,
configure the monitors, and see if it is working properly now.    You
can get the current Live USB desktop image at http://cdimage.ubuntu.com
/daily-live/current/ and create a USB boot drive using usb-creator.

** Changed in: xorg-server (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/840974

Title:
  configuration of external monitor on laptop does not work properly

Status in “gnome-control-center” package in Ubuntu:
  Confirmed
Status in “xorg-server” package in Ubuntu:
  Incomplete

Bug description:
  During test of Oneiric Beta 1 on my HP-G62 laptop testcase:
  http://testcases.qa.ubuntu.com/Hardware/GFX/ExternalPrimary I have
  this problem on configuration of external attached monitor:

  After powering on my laptop with an external monitor attached, when I
  unclick the duplicate check box and work only with the external
  monitor,  when you try to turn the laptop monitor on again it just
  remains black and only the external one works, can't get it back
  working, it works only if you check the duplicate check box again, but
  you can't switch off the external monitor and work with the laptop one
  if the external one is attached.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: gnome-control-center 1:3.1.5-0ubuntu4
  ProcVersionSignature: Ubuntu 3.0.0-9.15-generic 3.0.3
  Uname: Linux 3.0.0-9-generic x86_64
  Architecture: amd64
  Date: Sun Sep  4 14:40:31 2011
  ExecutablePath: /usr/bin/gnome-control-center
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Beta amd64 (20110901)
  ProcEnviron:
   PATH=(custom, no user)
   LANG=it_IT.UTF-8
   SHELL=/bin/bash
  SourcePackage: gnome-control-center
  UpgradeStatus: No upgrade log present (probably fresh install)

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