The touchpad in the IdeaPad is much to fast and the scrolling area is much to wide, so I had to reconfigure the synaptics driver in xorg.conf. I also enabled SHMConfig, so I can reconfigure it while while X is running. Unfortunatelly the multitouch-feature doesn't work (yet).
Section "InputDevice"
Identifier "Synaptics Touchpad"
Driver "synaptics"
Option "SendCoreEvents" "true"
Option "Device" "/dev/psaux"
Option "Protocol" "auto-dev"
Option "SHMConfig" "1"
Option "RightEdge" "500"
Option "HorizEdgeScroll" "0"
Option "HorizScrollDelta" "0"
Option "AccelFactor" "0.0015"
Option "MinSpeed" "0.025"
Option "MaxSpeed" "0.065"
Option "VertScrollDelta" "400"
EndSection
I hope one day to get the multitouch working and maybe find out how to setup different horizontal and vertical speeds.