Same problem on an Asus X202E. When starting up off a cold boot, xinput --list 
won't show the touchscreen device. However, after getting out of suspend mode, 
the touchscreen appears according to xinput --list. 
When I take a look at the log files, I get pretty much the same lines as 
gravity.
It is also interesting to notice that without putting the laptop in suspend 
mode after startup and resuming it, compiz and therefore unity crashes very 
often. Resuming solves the crashes and then the computer works great again.

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Packages, which is subscribed to xserver-xorg-input-evdev in Ubuntu.
https://bugs.launchpad.net/bugs/1180881

Title:
  Touchscreen only works after suspend/resume on Lenovo ideapad P400
  Touch

Status in “xserver-xorg-input-evdev” package in Ubuntu:
  Confirmed

Bug description:
  Touchscreen is unresponsive on fresh 13.04 Ubuntu installation.  All
  other devices work.

  Touchscreen shows as working and 'states' are correct for any xinput
  --list off of a cold boot.

  However, if I (at any point) "Suspend" the system, then awaken it, the
  Touchscreen immediately functions properly.

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