ctrl+fn+F11 on Mac to change the landscape to portrait and vice versa.
left-ctrl+F11on Windows 7.
For Mac users, you only need to use the fn key if the setting “Use all F1, F2 etc. keys as function keys” (under System Preferences -> Keyboard) is checked.
left-ctrl+F11on Windows 7 It works fine in Windows 7 for android emulator to change the landscape orientation to portrait and vice versa.
This just saved my day!
Source : Stackoverflow