Try updating the BIOS, I believe that's what made it work on mine in the short time that I played with Win 8 on it.
The BIOS update download says that it's from last month, but that's just the updater program. When you load the program it'll have an update in it.
Edit: Since it's really a UEFI and not a BIOS, it's listed as the "Firmware" download. Also, you'll need to install the Win7 accelerometer driver.