Same issue of nubia z7, maybe the model of your touchscreen is different from a standard synaptic or cypress. Could you do me a favor?
With cyanogenmod file manager navigate to data/tp (you have to grant superuser permission to filemanager settings--> general option --> scroll down --> select root mode)
in data/tp , select tap_to_wake and click propriety, and report me the field "Link (ex. /sys/devices/f99... ecc ecc)"