Touchpad Dell xps 13 (9333) ubuntu

I have ubuntu 15 on Dell XPS 13. All run, without touchpad. I have not an error. I suppose kernel doesn't see it.

synclient -l
Couldn't find synaptics properties. No synaptics driver loaded?

dmesg | grep pnp
[ 0.181032] pnp: PnP ACPI init
[ 0.181257] pnp 00:01: Plug and Play ACPI device, IDs PNP0b00 (active)
[ 0.181353] pnp 00:03: Plug and Play ACPI device, IDs PNP0303 (active)
[ 0.181381] pnp 00:04: Plug and Play ACPI device, IDs SYN0608 PNP0f03 (active)
[ 0.182665] pnp: PnP ACPI: found 7 devices

The mouse and touchpad setting is without touchpad, and I don't understand why.

Luca