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Touchpad of my hp probook 4540s notebook worked perfectly on both windows and ubuntu 12.04 . Suddenly it does not work on ubuntu 12.04 but it work perfectly on windows 7 . How can i enable touchpad on ubuntu 12.04 ???

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Try updating your drivers, remove the battery, turn the PC off and unplug all external devices.

If nothing of the previous worked for you, call HP, they will replace the TouchPad.

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See the value of TouchpadOff using:

synclient -l | grep TouchpadOff

If it's set to one, just enter this to enable it back:

synclient TouchpadOff=0
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