Here is the dmesg output of when this last happened:
[ 365.304496] psmouse.c: TouchPad at isa0060/serio1/input0 lost synchronization, throwing 4 bytes away.
[ 365.827318] psmouse.c: resync failed, issuing reconnect request
[ 387.700302] psmouse.c: TouchPad at isa0060/serio1/input0 lost sync at byte 4
[ 387.701885] psmouse.c: TouchPad at isa0060/serio1/input0 lost sync at byte 1
[ 387.703597] psmouse.c: TouchPad at isa0060/serio1/input0 lost sync at byte 1
[ 387.712677] psmouse.c: TouchPad at isa0060/serio1/input0 lost sync at byte 4
[ 387.715189] psmouse.c: TouchPad at isa0060/serio1/input0 lost sync at byte 1
[ 387.715193] psmouse.c: issuing reconnect request
FWIW, I've had this problem too. I found a fix for this (http:// ubuntuforums. org/showthread. php?t=1852081& page=4& styleid= 109) is to run "synclient TouchpadOff=0" from a terminal.
Here is the dmesg output of when this last happened:
[ 365.304496] psmouse.c: TouchPad at isa0060/ serio1/ input0 lost synchronization, throwing 4 bytes away. serio1/ input0 lost sync at byte 4 serio1/ input0 lost sync at byte 1 serio1/ input0 lost sync at byte 1 serio1/ input0 lost sync at byte 4 serio1/ input0 lost sync at byte 1
[ 365.827318] psmouse.c: resync failed, issuing reconnect request
[ 387.700302] psmouse.c: TouchPad at isa0060/
[ 387.701885] psmouse.c: TouchPad at isa0060/
[ 387.703597] psmouse.c: TouchPad at isa0060/
[ 387.712677] psmouse.c: TouchPad at isa0060/
[ 387.715189] psmouse.c: TouchPad at isa0060/
[ 387.715193] psmouse.c: issuing reconnect request