I've created a script for lightDM to check the state of the keyboard with 
xinput: it starts when X is loaded (tested with display-setup-script and 
greeter-setup-script options) and check the state of the internal keyboard then 
create a txt in my home. 
The keyboard is correctly identified from the script but still is unusable for 
10-15 seconds.

Here's the script I've used:

#!/bin/bash
xinput query-state 10 >/home/effe.state.txt # check if KeyClass is up
xinput float 10 && xinput reattach 10 3 #try to force the keyboard on

Hope it helps.

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https://bugs.launchpad.net/bugs/1599306

Title:
  [HP Pavilion dv2910us Entertainment Notebook PC] i8042 need to start
  early after grub

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