Comment 10 for bug 1247668

I also experienced this weird NumLock state described by Egmont (5 is a digit, the rest are cursor keys).

I only use one keyboard layout (Hungarian) and don't want to switch it to any other, thus I deleted the English one in the System Settings / Text Entry.
But after startup my keyboard layout is mostly set to English (which is also described by others, e.g. http://askubuntu.com/questions/362973/keyboard-layout-switches-to-english-each-time-i-reboot).

Setxkbmap shows the following:
    $ setxkbmap -query
    rules: evdev
    model: pc105
    layout: us

So I have to manually switch to Hungarian either by
1.) clicking on the only Hungarian item in the keyboard indicator,
(Setxkbmap shows:
    rules: evdev
    model: pc105
    layout: hu,us
    variant: , )

2.) or entering setxkbmap hu in the terminal.
(Setxkbmap shows:
    rules: evdev
    model: pc105
    layout: hu )

But after this and using any modifier key (e.g. switching tasks with Alt+Tab or switching desktops with Ctrl+Alt+cursors) I face the mentioned inconsistent numpad state.
BTW numlockx says:
    $ numlockx status
    Numlock is on

Since I have to do the layout switching only once after startup I overcame this faulty behavior with a script starting automatically after login, as follows:

#!/bin/sh
setxkbmap hu
numlockx off
numlockx on