I received an x220 that was built in September 2011 with the IPS screen. The screen generally appears very yellow (even at brightness level 15, and especially as brightness is reduced) and seems to reproduce other colors poorly (i.e. reds lean towards orange). When I compare the screen with multiple other notebooks, the yellow coloration is very noticeable. Otherwise, brightness, contrast and viewing angles are very good. Any suggestions on fixing this color issue would be greatly appreciated.