Public bug reported:

The problem is very simple. What ever I change the NumLock status by
pressing 'Shift' + 'ScrLock' as is supposed to work on ThinkPad T43, the
light identifying the num lock status doesn't change in some context. To
give a good explanation of the problem I identify 6 different scenarios.
Each of them have been run with different parameters and so are the
result.

For each scenario, I define 2 parameters :
With external keyboard : define  if I use an external keyboard or not
BIOS Setting set to: Define the BIOS settings. In the ThikPad BIOS is possible 
to define the behavior of the NumLock. Two options are available 'Synchronized' 
and 'Independent'. Here the definition of each of them : 
- Independent : Thinkpad NumLock can be disabled independently of the NumLock 
state on external keyboard. If ThinkPad NumLock is enabled, the external 
keyboard NumLk will also be enabled.
- Synchronized : Thinkpad NumLock and NumLock on an external keyboard are 
synchronized.

x.1) In safe mode drop in a root shell
x.2) In login screen (gdm) or gnome as the behavior is alway the same.

Scenario #1
With external keyboard: No
BIOS Setting set to : Synchronized
1.1) Work as expected. Can switch NumLock status. Can switch from letters and 
numbers.
1.2) NumLock are not in sync. The NumLock light doesn't change. Can switch from 
letters and numbers.

Scenario #2
With external keyboard: Yes (PS2 on dock-station or USB)
BIOS Setting set to : Synchronized
2.1) Can switch NumLock on external keyboard. Can switch from letters and 
numbers on external keyboard. The laptop's keyboard cannot insert numbers. The 
laptop's keyboard cannot change the NumLock status. (I don't consider this 
behavior as a bug as there is an external keyboard to do it.)
2.2) Same as 1.1


Scenario #3
With external keyboard: No
BIOS Setting set to : Synchronized
3.1) Work as expected. Can switch NumLock status. Can swtich from inserting 
letters to number.
3.2) Can switch NumLock status. Cannot insert numbers ! It's inserting letter 
or move the mouse.

Scenario #4
With external keyboard: Yes (PS2 on dock-station or USB)
BIOS Setting set to : Synchronized
4.1) Work as expected. Can switch NumLock status on external keyboard. Can 
swtich NumLock status on laptop. Every opperation are consistent
4.2) Nothing are in sync. More I play with it, more I get confused. It's switch 
between inserting number, inserting letters ans moving mouse. There is 
absolutly no logic with the NumLock ligth being on or off.

So there is two problems :
1.2 where X doesn't behave like kernel do
4.2 where X get confused with more then one keyboard.

** Affects: ubuntu
     Importance: Undecided
         Status: New

-- 
NumLock are not sync with the real status on ThinkPad T43
https://bugs.launchpad.net/bugs/358134
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