A tela sensível ao toque não funciona após a atualização de 14.04 a 15.04

Question

Minha touchscreen funcionou bem com o 14.04, mas parou para responder depois que atualizei o sistema para o 15.04.

O laptop é o ASUS ux302lg.

$ xinput
Virtual core pointer           id=2 [master pointer  (3)]
    ↳ Virtual core XTEST pointer id=4   [slave  pointer  (2)]
    ↳ ETPS/2 Elantech Touchpad   id=14  [slave  pointer  (2)]
    ↳ Atmel Atmel maXTouch Digitizer id=11  [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)]
    ↳ Video Bus                   id=8  [slave  keyboard (3)]
    ↳ Sleep Button                id=9  [slave  keyboard (3)]
    ↳ HD WebCam                   id=10 [slave  keyboard (3)]
    ↳ Asus WMI hotkeys            id=12 [slave  keyboard (3)]
    ↳ AT Translated Set 2 keyboard id=13    [slave  keyboard (3)]