Ha haaa... thanks Lukasz; I went up to the kernel i8042.c to understand
the ignore option and concluded that it does nothing ;)

I've just updated /etc/default/grub with:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash i8042.reset"

If someone is interested, here are the i8042 kernel option:
        i8042.debug     [HW] Toggle i8042 debug mode
        i8042.direct    [HW] Put keyboard port into non-translated mode
        i8042.dumbkbd   [HW] Pretend that controller can only read data from
                             keyboard and cannot control its state
                             (Don't attempt to blink the leds)
        i8042.noaux     [HW] Don't check for auxiliary (== mouse) port
        i8042.nokbd     [HW] Don't check/create keyboard port
        i8042.noloop    [HW] Disable the AUX Loopback command while probing
                             for the AUX port
        i8042.nomux     [HW] Don't check presence of an active multiplexing
                             controller
        i8042.nopnp     [HW] Don't use ACPIPnP / PnPBIOS to discover KBD/AUX
                             controllers
        i8042.notimeout [HW] Ignore timeout condition signalled by conroller
        i8042.reset     [HW] Reset the controller during init and cleanup
        i8042.unlock    [HW] Unlock (ignore) the keylock

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https://bugs.launchpad.net/bugs/1014240

Title:
  [Asus eeepc 1225B] Keyboard and Touchpad randomly not working  at
  startup

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