Public bug reported:

Binary package hint: gnome-control-center

In Ubuntu 9.10 (Karmic Koala) the "Disable touchpad while typing" option
causes an otherwise disabled touchpad to be re-enabled after typing
ceases.

The expected behaviour is that a disabled touchpad stays disabled until
it is explicitly re-enabled.

To reproduce:

1. Enable the "Disable touchpad while typing" option in "Properties ->
Mouse -> Touchpad".

2. Disable the touchpad via the ACPI hotkey (Fn-F8 on my ThinkPad); or

     xinput set-int-prop "SynPS/2 Synaptics TouchPad" "Synaptics Off" 8
1

3. Type.

4. Stop typing: the touchpad has been enabled again.

Disabling the "Disable touchpad while typing" option stops the touchpad
from being re-enabled.  This is a workaround.

Another workaround is to completely disable the device by doing
something like:

  xinput set-int-prop "SynPS/2 Synaptics TouchPad" "Device Enabled" 8 0

This seems to stop the above option in its tracks.

The real fix would seem to be to have the "Disable touchpad while
typing" option respect the "Synaptics Off" setting.

The bug is in gnome-mouse-properties from:

  gnome-control-center:
    Installed: 1:2.28.1-0ubuntu1

** Affects: gnome-control-center (Ubuntu)
     Importance: Undecided
         Status: New

-- 
Disable touchpad while typing option causes disabled touchpad to be re-enabled
https://bugs.launchpad.net/bugs/501990
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