Same problem here: ASUS K53SC GeForce GT 520MX/PCIe/SSE2 => Nvidia-331.38 Ubuntu 14.04 AMD64 synaptics: ETPS/2 Elantech Touchpad
Same problem here:
ASUS K53SC
GeForce GT 520MX/PCIe/SSE2 => Nvidia-331.38
Ubuntu 14.04 AMD64
synaptics: ETPS/2 Elantech Touchpad