Just to confirm, I just finally found the graphics driver and it is updated. It's Intel HD Graphics 3000. Windows 7 64-bit, Thinkpad x220. The f.lux icon on the bottom left indicates that the program is on, but the color shift is not happening (to make sure my eyes hadn't adjusted, I clicked "disable for one hour" and the color stays the same) on my laptop - but it's fine and working on my second display.
Thanks.