I get a similar problem with a slight variation, this occured after apug. Whereas the touchpad works smoothly scrolling and all, the keyboard typing is laggy and the left mouse click does not work.
Applying ': sudo killall syndaemon ; syndaemon -d -K -R -i 0.9' kills the whole touchpad and i had to reboot. But seems to work better now. Will update findings
Edit:
The keyboard no longer lags but the left click touchpad button gets disabled for upto5 -10 secs or works intermittently
