Hey, i have the same specs as you do. What method did you use to install Lion? Please give me some information so I can do on my laptop.
I've installed Lion DP4 and latest update on my X220 with chameleon boot loader.
works without any change:
CPU I5 2410M
Graphic Intel HD 3000 with 1366*768
touchpad and red point
works with external driver:
sound with VoodooHDA
wireless card (using usb wireless instead)
Does any one know how to make X220 sleep and wake? Appreciate any help.