Attach Keyboard/Mouse to X Display in Dell XPS L502x Dual Video Cards (Intel/Nvidia HDMI)

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http://askubuntu.com – The idea: Use a second monitor in Dell XPS L502x with HDMI port in Ubuntu 12.04 The process: I connect the HDMI cable to monitor. I read http://hanynowsky.wordpress.com/2012/04/07/dell-xps-15-l502x-ubuntu-linux/ and i have video in HDMI monitor with Bumblebee and this commands: optirun nvidia-settings -c :8 DISPLAY=:8.0 firefox I have created a second keyboard/mouse master group with xinput with this solution: http://superuser.com/questions/390458/multiple-keyboard-and-mouse-inputs The problem: The second monitor (Display 8) don't recognize the keyboard/mouse and i cant use it. The que (HowTos)