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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

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