Here is what I have got from the support team :
" The user(s) should be able to uninstall the synaptics-touchpad driver and re-install it to get it working. If I remember right, that rpm would be under /tmp/HP_SWSetup folder or /usr/share/HP_SWSetup folder. There may be a shorter solution but this solution seems simple.
From your question, should I gather that their update from SLED11SP1 to SLED11SP2 went fine?"
I also found a thread on touchpad synaptic involving Fedora : Did you try from the desktop panel "System>Preferences>Mouse>Touchpad> and see if everything is configured ?