[arch-general] Touchpad doesn't work since boot ocasionally

Kernel version linux 3.19-3 Randomly synaptic doesn't work. Usually while booting there are message about psmouse module loading and detecting synaptic. But rarely there are no messages about loading driver. And of course it doesn't work. Im using gnome-shell as DM How can I try to detect it? While disappearing lspci also does show synaptic device. Any other way? Ah, and reboot always turns touchpad back. Thanks in advace. P.S. was experiencing it since 3.9 maybe or even earlier