I have a lenovo ideapad 320. After installing ubuntu 16.04, the touchpad hasn't been working.

sometimes the touchpad will work for a few minutes after restarting, but it eventually stops working again. the touchpad is enabled in settings, and a usb mouse works just fine.

from xinput:

Virtual core pointer id=2 [master pointer (3)]

⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)]

⎜ ↳ Elan Touchpad id=13 [slave pointer (2)]

what should I do to fix this?

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