Apparently, I've found an easy way to use only the external display(clamshell mode) keeping the lid open in Mountain Lion 10.8.5.
This give various advantages : lower temperatures, use of the trackpad and internal webcam, better wifi signal.
Steps :
1) Put the displays to sleep with hot corners method.
2) Close the lid of the MacBook Pro
3)After 5 seconds, open the lid of 5 centimeters, and wait the external display to turn on
4)Complete the opening of the lid
Here is a Short video of the operation :
This give various advantages : lower temperatures, use of the trackpad and internal webcam, better wifi signal.
Steps :
1) Put the displays to sleep with hot corners method.
2) Close the lid of the MacBook Pro
3)After 5 seconds, open the lid of 5 centimeters, and wait the external display to turn on
4)Complete the opening of the lid
Here is a Short video of the operation :
Last edited: