touchpad error

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http://chakra-project.org – i updated the system completely. formatted everything old - now is a fresh system. i am really sure this time i did not consciously hit anything bad, but unfortunately i cannot scroll with my synaptic touchpad. i can point and navigate, but scrolling is not working. lsusb is not registering the touchpad as a usb device, lspci and lsmod also not showing synaptics eithermoreover, installing xf86-input-synaptics stops the touchpad completely. removing it causes the pointer to move.,what am missing? (HowTos)