Display Manager/Unity Panel Indicator for Ubuntu+Bumblebee+Multimon
This is currently experimental, but works in general unless there is an issue with the underlying Bumblebee/Nvidia/Driver setup. The usual "dev not responsible for damage to your system" applies.
You can find out more about installing and using thinkdisp here: http://sagark.org/thinkdisp/
The two kill scripts killdisp1 and killdisp2 are adapted from http://zachstechnotes.blogspot.com/2012/04/post-title.html