[xmonad] Issue 502 in xmonad: Multihead trouble docs update -- xrandr required for proper display

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Comment #3 on issue 502 by MathStuf at gmail.com: Multihead trouble docs  
update -- xrandr required for proper display
http://code.google.com/p/xmonad/issues/detail?id=502

"randr" is a contraction of "Resize and Rotate" which allows you to switch  
up your monitor configuration at runtime (it's outside drivers so that  
every driver doesn't need something like the nvidia-settings GUI). This  
link[1] might be of interest to you.

The driver is probably seeing one screen after the driver maps the two  
displays together. Does your nvidia card have two GPUs?

There also seems to be indications that the nvidia driver might act weird  
when Xinerama and Xrandr are enabled.

[1]https://wiki.archlinux.org/index.php/NVIDIA#Enable_screen_rotation_through_XRandR