By default not all the Lenovo drivers are loaded by the Windows 8 Consumer Preview. So you might need to manually load some of the drivers. For e.g. I wanted the Tablet buttons to be enabled, so I manually installed the Thinkpad Tablet Button Drivers(On most x220t there will be a directory called called SQTOOLS. Locate the TBBTN which is located under Drivers. SWTOOLS\DRIVERS\TBBTN) That got the Thinkpad x220 Tablet buttons working for me. So I could now manually rotate the screen or lock or power down if needed.
The other thing which I did was go to the device manager (Press Win key + W and type Device manager).
Choose the Other devices and select each device which shows up there, and choose “Update Driver Software…)
Then ask it “Browse my computer…” to locate the drivers, and point it to the SWTOOLS\DRIVERS directory. Do this for each device and Windows 8 should be able to load the appropriate drivers.
Then do a reboot…