The u400 touchpad used to disable when i pressed the f6 key. However, once i installed the Windows 8 consumer preview, the touchpad stopped disabling. I installed the newest driver (the one released Feb 8) and still have no luck. They funny thing is, when i press f6, a sign appears on the lower right corner that shows a disabled touchpad (touchpad with a line across it). However, the touchpad still functions.
This is a pretty big issue for me since I find it nearly impossible to type comfortably without the touchpad being disabled. (For example, my cursor jumped 5 times when typing this post) I am sure I am not the only one with this problem. Please help! Worse comes to worst, i will reinstall windows 7, but if there is anyway to fix this problem, please let me know.
I didn't have exactly this issue but wanted to permanently disable but that was not going to be easy. Mine was hypersensitive and totally messed up any keyboard work. I called tech support and they installed new software to lessen the sensitivity but now when I push F6 key to disable, the icon you described keeps popping up every keystroke. These Lenovo guys are just useless and so sorry I bought this computer.