How to turn off external display?

Hi,
Does anyone know if there is a way to turn off a second display without unplugging the hdmi cable. If it can be done programmatically, then that would be great.
There is a bug where if you shut down and restart, then mission control adds the second display to the main display.
Thanks,
kel

hey i might be able to help you out
a few things you should know i have my phone set to turn off my backlight after 20 seconds... also i do not use the bedside mode it just dims the screen...
you can change this in your options under screen/keyboard 
now then to turn off your external display while your charging you phone go to your home screen and select you clock 
then push your menu button and select options
the under the  the CLOCK tap it should say: WHEN CHARGING... set that option to DO NOTHING...
and there you go i hope this helps...
 ~HaZe42o~

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