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I have installed Ubuntu 12.04.2 in my laptop Lenovo Ideapad Z500 and everything worked fine, but for some problems i had to reinstall nvidia drivers, xserver-xorg and ubuntu-desktop. Then, my touchpad stopped working and I found a solution running de following commands:

sudo modprobe-r psmouse    
sudo modprobe psmouse proto proto=imps

Now, my touchpad works but I can't use scrolling with 2 fingers and multitouch features. I think it's because It's been recognized as a Generic mouse, not Synaptics Touchpad. If I run command

$ xinput list

⎡ Virtual core pointer                      id=2    [master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer                id=4    [slave  pointer  (2)]
⎜   ↳ PS/2 Generic Mouse                        id=12   [slave  pointer  (2)]
⎣ Virtual core keyboard                     id=3    [master keyboard (2)]
    ↳ Virtual core XTEST keyboard               id=5    [slave  keyboard (3)]
    ↳ Power Button                              id=6    [slave  keyboard (3)]
    ↳ Video Bus                                 id=7    [slave  keyboard (3)]
    ↳ Power Button                              id=8    [slave  keyboard (3)]
    ↳ Video Bus                                 id=9    [slave  keyboard (3)]
    ↳ Lenovo EasyCamera                         id=10   [slave  keyboard (3)]
    ↳ AT Translated Set 2 keyboard              id=11   [slave  keyboard (3)]
    ↳ Ideapad extra buttons                     id=13   [slave  keyboard (3)]

Thanks.

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