in relation to this question, I'm using the xrandr command in osx to perform operations on my external monitors. Unfortunately it does not appear to be recognising external montitors at all:

Cobrakai$xrandr  --verbose --screen 1
Invalid screen number 1 (display has 1)

Whereas it works fine for screen 0 (my native screen)

Cobrakai$xrandr  --screen 0
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 640 x 480, current 2304 x 1824, maximum 2304 x 1846
default connected 2304x1824+0+0 0mm x 0mm
   1280x800       60.0      2.0  
   1152x720       60.0  
   1024x768       60.0  
   1024x640       60.0  
   800x600        60.0  
   800x500        60.0  
   640x480        60.0  
   720x480        60.0  
   1280x778        1.0  
   1280x1824       1.0  
   1280x1846       2.0  
   2304x1824       1.0* 
   2304x1846       2.0  

Even when other applications can tell that there are many screens (per screenshot) - how do I get xrandr to recognise the additional screens?

enter image description here


Turns out that at least part of the problem is that the Xrandr utility is designed only to deal with X11 windows and not native osx screens...

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