I'm experiencing the same thing on a T410s Thinkpad (intel graphics
only, no AMD or NVIDIA). I think I'm actually running the 32-bit OS
(accidentally... oops)

T410s:~$ sudo dmidecode -t 11
# dmidecode 2.9
SMBIOS 2.6 present.

Handle 0x0027, DMI type 11, 5 bytes
OEM Strings
        String 1: IBM ThinkPad Embedded Controller -[6UHT29WW-1.10    ]-

T410s:~$ sudo lspci | grep -i vga
00:02.0 VGA compatible controller: Intel Corporation Core Processor Integrated 
Graphics Controller (rev 02)

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https://bugs.launchpad.net/bugs/766490

Title:
  [Natty-Beta2] Turning off laptop monitor turn off both monitors
  (laptop and external) on Vostro 3500

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