I also have this problem on a Thinkpad T410 with the i5 processor with Intel
integrated video. I am running the 64-bit OS. This worked without an issue on
Maverick.
-T410:~$ 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 -[6IHT39WW-1.14 ]-
-T410:~$ 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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