The touchpad on my Dell Inspiron 7791 2 in 1 does not initially work if I convert from display mode (folded over backwards) back to laptop mode. The touchpad and keyboard are apparently disabled with the laptop folded over backwards. The keyboard is reactivated when the system is restored to the laptop configuration but the touchpad may not work and the mouse cursor is missing from the screen. It takes a couple of reboots to restore the touchpad functionality.