HT3131: Mac notebooks: How to use your computer in closed clamshell (display closed) mode with an external displayLearn about Mac notebooks: How to use your computer in closed clamshell (display closed) mode with an external display
Currently Being ModeratedNov 19, 2012 6:42 AM (in response to Lindberg)
I think i just found the solution..
1) connect the external display (both are working), and make sure the external is the primary display.
2) use a magnet to shut the internal display off (only the external is working by now).
3) lift up the magnet and quickly close the lid.
I succeed using the clamshell mode using this method. Hope to hear good news from you all.
Macbook Air 13inch 2011
OS X 10.8.2
Currently Being ModeratedDec 11, 2012 8:07 AM (in response to Lindberg)
Hi, I have the same problem with an MBA 11´. I realized the problem arises when the mac is not connected to the electric supply. Once connected it to the power supply and it seems to be working fine now. I also have an MBA 13, and it doesn´t have this problem.
Currently Being ModeratedJan 17, 2013 11:26 AM (in response to Lindberg)
I tried "sudo nvram -d boot-args" and reboot and it still was shutting off. Then I plugged in Macbook Air to the external power source and I can now work in clamshell mode without the Mac going to sleep. Apparently the external power needs to be connected for the clamshell mode to work.