Henrique, I respectfully disagree with the assertion that it is simply a
matter of timing. This is very reproducible for me regardless of the
delay set with syndaemon. If you have access to a MacBook Pro 6,2 or
similar hardware, I encourage you to try this test to see it for
yourself:

Open a terminal and right-click the title bar and chose: 'Always on top', and 
enter the following:
 syndaemon -i 10 -k
That should disable the touchpad from activating for 10 seconds after the last 
keystroke. Overkill I know, but necessary to demonstrate the error and remove 
any speculation about this being a timing issue.

Here is how you can see the bug:
With that terminal open and 'on-top', it should be toggling between 'enabled' 
and 'disabled'. Type some text in a field (respond to this comment, for 
example.) Be sure to position your cursor in a position where it will be 
obvious if it registers a click (at the top, left-most line of this text box, 
for example.)

As you type, occasionally tap the touchpad. If your hardware is also
experiencing this bug, you will notice that the cursor is repositioned
and your typing jumps to the upper-left of the textbox, even though it
has been much less than 10 seconds since your last kestroke. Not every
time, but it does happen.

If this happens while you are attempting to compose an email, writing a
paragraph or sentence, or simply filling in a single textfield, I
suspect you too would quickly become extremely frustrated with this bug.

If this isn't reproducible on the hardware you have, I recommend opening
a 'wishlist' item for the gconf setting discussed above.

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https://bugs.launchpad.net/bugs/27541

Title:
  Disable Touchpad while typing doesn't work consistently - hardware-specific?

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