Still in Ubuntu 13.04, UX32VD (BIOS 214)

On reboot, when external monitor is connected,  the BIOS displays "post"
messages on external monitor only, the laptop's internal screen shows
nothing - it is black.

When the Ubuntu starts up, internal screen remains black. The Fn+F8
(shortcut to switch internal/external screens) has no  effect. It seems
LED backlight on internal screen is ON. See my dmesg.txt .

It is possible to switch the screens with Fn+F8 while the Grub greeting
is showed and before kernel boots up, .  In this case, the external
monitor is turned off and  internal screen turned on. When Ubuntu boots,
external monitor turns on and displays the same that displays internal.

** Attachment added: "dmesg.txt"
   
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1076389/+attachment/3649883/+files/dmesg.txt

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https://bugs.launchpad.net/bugs/1076389

Title:
  [12.10] eDP with external monitor plugged in, only external monitor
  works

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