Wacom pen input/touchscreen problems on Lenovo X220 Tablet

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https://bbs.archlinux.org – Recently my touchscreen and pen input on my Lenovo X220 tablet have stopped working. Browsing on the forums, I found this post which seemed to document my exact problem. It recommended to downgrade to the 3.4.9 Linux kernel and to uninstall and reinstall the xf86-input-wacom package. I've followed both of these steps, but to no avail: the pen and touchscreen have no effect on my computer. Additionally, the wacom driver is no longer loaded during bootup (lsmod | grep wacom results in nothing), and it is not even mentioned in dmesg (using dmesg | grep -i wacom). However, the device is prese (HowTos)