Comment 5 for bug 1433444

I got a response back from the linuxwacom-discuss mailing list saying that the USB_DEVICE_WACOM(HID_ANY_ID) catch-all rule should be sufficient for an integrated device like this one. So the real solution is to just install a more recent kernel. The rest will depend on the X driver settings.

Solution:
Use a 3.18 or newer kernel.

Here's what I've found so far:

By default, the "wacom" driver is applied by 50-wacom.conf in xorg.conf.d. In this mode, you get normal single touches/drags and two-finger gestures (like scrolling and right click).

There are a couple of alternatives I've found, and both have about the same result: three- and four-finger Unity gestures work (https://wiki.ubuntu.com/Multitouch), but two-finger gestures no longer work everywhere. Some applications seem to support two-finger scrolling while others don't. I can live with that, so I prefer to implement an alternative to enable the three- and four-finger gestures.

Alternative 1: delete 50-wacom.conf or comment out the "Wacom class" so that X use the "evdev" driver instead of the "wacom" driver.

Alternative 2: Add 'Option "Gesture" "off"' in the "Wacom class" section of 50-wacom.conf to disable in-driver two-finger gestures so that they will be passed up to X instead. (see http://linuxwacom.sourceforge.net/wiki/index.php/Multitouch#Disable_xf86-input-wacom_In-driver_2FGT_Gestures).

I haven't thoroughly tested these two alternatives to know if there are any other differences, but for now I'm using Alternative 2.

Bug 1227214 seems to be covering the remaining matter of three- and four-finger gestures not working when running with the "wacom" driver without also disabling in-driver two-finger touches (and losing a lot of two-finger gesture functionality across the board in the process).