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After installing Ubuntu 12.04 LTS on my U400 Lenovo, I found some hotkeys are not working( enable/disable touchpad, display on/off, webcam enable/disable )

How to fix the problem?

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I am using Idepad Z370 and have the same problem. Lenovo support pages says there is no Linux driver yet. – Olcay Ertaş Jul 9 '12 at 15:05
I have experience with that, but for me only display was important and what I did is that I wrote small bash script #!/bin/sh;xset dpms force off(use enter instead of ;) and in Keyboard->Shortcuts->Own shortcuts I create new event and set this script to run when pressing on some button – Victor K Jul 22 '12 at 19:51

A useful hotkeys trouble shooting page worth looking at is:

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