Ubuntu

Comment 6 for bug 199682

To fix Touchpad on/off button in both 7.10 and 8.04 one has to edit /etc/X11/xorg.conf file to include the SHMConfig option into "Input Device" section as follows:

Section "Input Device"
 Identifier "Synaptics Touchpad"
........
Option SHMConfig "1"
EndSection