Welcome to my brain-capacitance-extention :)
Here you'll actually find everything I think it's worth not forgetting about it.
I recently realized, that my X220 was not allowing the gpu to use RC6.
Just modify your lilo.conf and run lilo. After reboot you get a system with <8W idle power consumption :)
# LILO configuration file # generated by 'liloconfig' # # Start LILO global section # Append any additional kernel parameters: append=" vt.default_utf8=0 i915_enable_rc6=7" boot = /dev/sda
Slackware-Current (March 2012) works quite well. But you'll need to update XF86-Input-Wacom to get the touchscreen working.
Just upgrade the package (can be found here) and everything is fine :)