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Some Lenovo touchpads are over sensitive and they cause the cusor to slip or jump around. In Control Panel select Mouse or Touchpad. A box will open and you can locate touchpad Properties and adjust the sensitivity. Lenovo also has updated touchpad software/drivers for one or two of the most troublesome models. i was able to reduce the cursor jumping around quite a bit by adjusting the sensitivity, but i still don't think it's a good design.
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Straight from the user guide, just discovered it today because I have also been having this frustrating problem. Use Fn + F6 - it is a toggle switch to enable and disable the Touchpad. I have a Lenovo wireless mouse now instead.
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It is a fault with Lenovo laptops. My cursor jumps all the time, no matter what software I am using. It is NOT the 'sensitivity' of the touchpad, for my cursor jumps even when I am not typing, even if I don't touch the laptop! I can set the cursor to a certain point on a document and then, after about 30 seconds, it will just jump to another point, even if I am in another room.