Dell 2-in-1 3147:
The "DELL Pointing Devices" dialog shows a "Disable Touchpad when USB Mouse Present" checkbox. If this checkbox is clear, the touchpad works properly. When this checkbox is marked, the touchpad does not work at all.
I have tried both USB and Bluetooth mice, and neither one allows the proper action: the touchpad should be enabled without a mouse, and the touchpad should be disabled with a mouse. That's how it works on other systems. It just doesn't work at all on this system.
I suspect there is some interaction between the touchpad and the touchscreen that is interfering with this setting. But I have another laptop with a touchpad and a touchscreen, and the mouse detection works there (it's not a DELL).
Yes, I have toyed with the idea of deleting the DELL touchpad control application and installing a "stock" Synaptics touchpad driver. But I don't want the DELL "update" app to overwrite it with the DELL touchpad control app every time it sees "the wrong driver" loaded. And I don't want to take the chance that the touchpad driver and the touchscreen driver are somehow linked together, thus disabling one when I disable the other.
Any ideas on how to get the "Disable Touchpad when USB Mouse Present" action working would be welcome.
I would love to know where to find that checkbox ... Thank you!
Dell 2-in-1 3147:
The "DELL Pointing Devices" dialog shows a "Disable Touchpad when USB Mouse Present" checkbox.
I know this is a very late reply. Most people have trouble finding it. I caught the option only by chance.
Mouse & touchpad settings --> Dell Touchpad
Click on: "Click to change DellTouchpad settings
You should be in a new window: Dell Pointing Devices.
On top you'll see two images: a touchpad and a mouse.
Click on the mouse image.
There it is! It's amazingly well hidden. Perhaps this will help someone who is searching for it.