Display Manager/Unity Panel Indicator for Ubuntu+Bumblebee+Multimon and intel-virtual-output instead of screenclone
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.
Installation and Usage
Howto setup intel-virtual-output can be found here: http://www.unixreich.com/blog/2013/linux-nvidia-optimus-on-thinkpad-w520w530-with-external-monitor-finally-solved
You can find out more about installing and using thinkdisp here: http://sagark.org/thinkdisp/
Based on the project of sagark and it's contributors