Cheers for confirming
I may well give that a try..
This page shows Synaptics used to have this feature.
But clearly no more.. I tried the regedit change suggested on this, but made no difference at all....
I have exactly the same menu but without the red marked option - my inspiron touchpad is listed as "standard pointing device" so the synaptic driver is not fully compatible with my touchpad - but I should still see at least the (disabled) option you are looking for.
Furthermore: did you compare the driver versions? v14.0.4 03Sep09 (the one with the option) to v15.1.15 23Sep10.
It looks like they removed the option in the updated version.....
SOLVED SOLVED SOLVED!!!
All - I've read through this and many forums and have found no solution. I figured it out on my own, so I am happy to share with you!
This solution applies to those who do not have a touchpad disable button on an F key at the top of your keyboard and have the Synaptics driver that does not show the option to disable the touchpad when the external device is present. This also applies to those where the registry key update does not work (as it did not for me).
Here's the solution.
1. Go to the Dell website and get the latest driver for your touchpad. Install it.
2. Once installed, go to c:\program files\synaptics\syntp in your windows explorer.
3. Open the program called DellTpad.exe (there is also one called DellTouchpad.exe -- don't use this one)
4. Once open, click Device Settings.
the above options which you have posted are which Synpatics driver version, i have tried even the registry fix but still does not work, the version i have installed is 15.2.6 dated 16dec2010.
THANK YOU very much for this great post.
I was searching all over this morning for a method to achieve this exact same thing when i finally stumbled upon your post. Worked like a charm.