Sony
Vaio VPCZ11X9E, no keyboard/touchpad on_boot or after
suspend/hibernate
Asdescribed here we must add i8042.nopnp to the kernel boot parameters in order to use the touchpad at all. Anyhow it sometimes happens that you reboot or suspend/hibernate and end up without mouse and keyboard. Up to today I always had to hard power off the machine, i.e. holding down the power button. Even if this only happens about once every 10 reboots, it is really annoying, so today I attached an usb keyboard to the machine and started investigating.

I discovered that just reloading the psmouse module does the trick of bringing
both the keyboard and the mouse back to life.

In order to make this automatic I added a couple of scripts to
my system.

The first one goes into /etc/pm/sleep.d/99i8042

#!/bin/sh

case "$1" in
 suspend|hybernate)
  modprobe -r psmouse
  ;;


 thaw|resume)
  modprobe psmouse
  ;;
esac

and the other one, to be saved as /etc/init/fix_touchpad.conf is

# reload the psmouse module

description     "Reload the psmouse driver because the buggy i8042 could mess it up after boot"
author          "Vincenzo Di Massa <hawk.it@tiscali.it>"

start on starting-dm
task
script
 modprobe -r psmouse
 sleep 1
 modprobe psmouse
end script