I have a new install of Fedora 17 64 bit with KDE on a HP 2000-416DX laptop. After installation, using the touchpad moved the pointer, but the sensitivity was way too low when tapping --- I almost had to punch the touchpad to get it to register taps. I went into System Settings -> Input Devices -> Touchpad and turned the sensitivity up. At that point, the mouse stopped responding altogether. It won't move the pointer or register clicks or respond in any way. When I turn the sensitivity down again, the pointer moves, but again, taps don't work properly.
I've updated my system, restarted my laptop, no change in touchpad behaviour.
F17/KDE 64 bit
ATI Radeon HD 6310
Broadcom 4313 Wireless Adapter (with proprietary drivers)